Carb fuel filters

K

Ken B

Well-known member
Oct 9, 2002
16,834
277
83
A note on the fuel filter inside the 455 or 403 carb.

It turns out that there are 2 different filter listed both by Ac Delco and Wix. In 1976 GM changed ALL filters of this type in all vehicles using
that filter. The change was adding a little rubber flapper check valve on the entrance side of the filter.

Either filter will fit in all years of our 455 and 403 engines with Quadrajet carbs.

AC Delco GF441 or Wix 33148 is the one without the check valve. (pre 1976)
AC Delco GF471 or Wix 33152 is the later version with the internal check valve and cost $1.80 more. (listed as 1976 and later)

I did not check out other brands and I also have no recommendation on which version to use.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
Here are some good pictures of the fuel filter and how it is installed. You can put them in backwards, ask me how I know!

http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
http://www.gmcmhphotos.com/photos/general-pictures/p58269-fuel-system-q-jet.html
http://www.gmcmhphotos.com/photos/general-pictures/p58268-q-jet-fuel-filter.html

J.R. Wright
GMC GreatLaker 18 Year Member
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI 18 Year Member
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan

>
> A note on the fuel filter inside the 455 or 403 carb.
>
> It turns out that there are 2 different filter listed both by Ac Delco and Wix. In 1976 GM changed ALL filters of this type in all vehicles using
> that filter. The change was adding a little rubber flapper check valve on the entrance side of the filter.
>
> Either filter will fit in all years of our 455 and 403 engines with Quadrajet carbs.
>
> AC Delco GF441 or Wix 33148 is the one without the check valve. (pre 1976)
> AC Delco GF471 or Wix 33152 is the later version with the internal check valve and cost $1.80 more. (listed as 1976 and later)
>
> I did not check out other brands and I also have no recommendation on which version to use.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
 
JR,

Good photos! This filter installs "backwards." When I say that filter are "supposed" to flow from the larger surface area "outside"
to the smaller surface area "inside." This filter is installed "backwards;" the flow enters on the "inside" and flows to the
"outside." It doesn't take a lot to plug it up!

That's why Ken Frey's idea of installing a filter in the rubber line that connects the metal line welded to the front crossmember
and the inlet to the mechanical fuel pump:

http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p54750-fuel-pump-inlet-filter.html

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of John Wright
Sent: Saturday, December 16, 2017 3:38 AM
To: gmclist
Subject: Re: [GMCnet] Carb fuel filters

Here are some good pictures of the fuel filter and how it is installed. You can put them in backwards, ask me how I know!

http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
http://www.gmcmhphotos.com/photos/general-pictures/p58269-fuel-system-q-jet.html
http://www.gmcmhphotos.com/photos/general-pictures/p58268-q-jet-fuel-filter.html

J.R. Wright
GMC GreatLaker 18 Year Member
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI 18 Year Member
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan

>
> A note on the fuel filter inside the 455 or 403 carb.
>
> It turns out that there are 2 different filter listed both by Ac Delco and Wix. In 1976 GM changed ALL filters of this type in
all vehicles using
> that filter. The change was adding a little rubber flapper check valve on the entrance side of the filter.
>
> Either filter will fit in all years of our 455 and 403 engines with Quadrajet carbs.
>
> AC Delco GF441 or Wix 33148 is the one without the check valve. (pre 1976)
> AC Delco GF471 or Wix 33152 is the later version with the internal check valve and cost $1.80 more. (listed as 1976 and later)

>
> I did not check out other brands and I also have no recommendation on which version to use.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana

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Wix must have seen the reversal problem. On the Wix version of this filter the back (non-entrance) side is manufactured slightly larger and will not
go in backwards. I have two of the non-check valve versions (33148) here and both were made that way. I can not verify the the 33152 version is the
same. I also have no idea what other brands have done.

> Here are some good pictures of the fuel filter and how it is installed. You can put them in backwards, ask me how I know!
>
> http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
> http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
> http://www.gmcmhphotos.com/photos/general-pictures/p58269-fuel-system-q-jet.html
> http://www.gmcmhphotos.com/photos/general-pictures/p58268-q-jet-fuel-filter.html
>
> J.R. Wright
> GMC GreatLaker 18 Year Member
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI 18 Year Member
> 78 Buskirk 30' Stretch
> 1975 Avion (Under Reconstruction)
> Michigan
>

> >
> > A note on the fuel filter inside the 455 or 403 carb.
> >
> > It turns out that there are 2 different filter listed both by Ac Delco and Wix. In 1976 GM changed ALL filters of this type in all vehicles
> > using
> > that filter. The change was adding a little rubber flapper check valve on the entrance side of the filter.
> >
> > Either filter will fit in all years of our 455 and 403 engines with Quadrajet carbs.
> >
> > AC Delco GF441 or Wix 33148 is the one without the check valve. (pre 1976)
> > AC Delco GF471 or Wix 33152 is the later version with the internal check valve and cost $1.80 more. (listed as 1976 and later)
> >
> > I did not check out other brands and I also have no recommendation on which version to use.
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
Any advantage to the non check valve version?

> Wix must have seen the reversal problem. On the Wix version of this
> filter the back (non-entrance) side is manufactured slightly larger and
> will not
> go in backwards. I have two of the non-check valve versions (33148) here
> and both were made that way. I can not verify the the 33152 version is the
> same. I also have no idea what other brands have done.
>

> > Here are some good pictures of the fuel filter and how it is installed.
> You can put them in backwards, ask me how I know!
> >
> > http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
> > http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
> > http://www.gmcmhphotos.com/photos/general-pictures/
> p58269-fuel-system-q-jet.html
> > http://www.gmcmhphotos.com/photos/general-pictures/
> p58268-q-jet-fuel-filter.html
> >
> > J.R. Wright
> > GMC GreatLaker 18 Year Member
> > GMCGL Tech Editor
> > GMC Eastern States Charter Member
> > GMCMI 18 Year Member
> > 78 Buskirk 30' Stretch
> > 1975 Avion (Under Reconstruction)
> > Michigan
> >

> > >
> > > A note on the fuel filter inside the 455 or 403 carb.
> > >
> > > It turns out that there are 2 different filter listed both by Ac
> Delco and Wix. In 1976 GM changed ALL filters of this type in all vehicles
> > > using
> > > that filter. The change was adding a little rubber flapper check
> valve on the entrance side of the filter.
> > >
> > > Either filter will fit in all years of our 455 and 403 engines with
> Quadrajet carbs.
> > >
> > > AC Delco GF441 or Wix 33148 is the one without the check valve. (pre
> 1976)
> > > AC Delco GF471 or Wix 33152 is the later version with the internal
> check valve and cost $1.80 more. (listed as 1976 and later)
> > >
> > > I did not check out other brands and I also have no recommendation on
> which version to use.
> > > --
> > > Ken Burton - N9KB
> > > 76 Palm Beach
> > > Hebron, Indiana
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Rob,
I removed the internal filter out of my original carb on the 77 403 just
after I got it in 1998. I ran a 2 filter system and did convert to an
electric fuel system with a electric fuel pump just after the selector
valve. I ran a filter in the same spot that Ken F put his and one between
the selector and the pump. When I changed the filters, I put a new filter
at the carb end and move the one there to the spot before the fuel pump.

http://www.gmcmhphotos.com/photos/g3657-electric-fuel-pump-26amp-3b-filter.html

John

J.R. Wright
GMC Great Laker
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 30' Stretch
75 Avion (Under going Frame up Restoration)

On Fri, Dec 15, 2017 at 1:00 PM, Rob Mueller
wrote:

> JR,
>
> Good photos! This filter installs "backwards." When I say that filter are
> "supposed" to flow from the larger surface area "outside"
> to the smaller surface area "inside." This filter is installed
> "backwards;" the flow enters on the "inside" and flows to the
> "outside." It doesn't take a lot to plug it up!
>
> That's why Ken Frey's idea of installing a filter in the rubber line that
> connects the metal line welded to the front crossmember
> and the inlet to the mechanical fuel pump:
>
> http://www.gmcmhphotos.com/photos/aa-miscellaneous-
> photos/p54750-fuel-pump-inlet-filter.html
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of John
> Wright
> Sent: Saturday, December 16, 2017 3:38 AM
> To: gmclist
> Subject: Re: [GMCnet] Carb fuel filters
>
> Here are some good pictures of the fuel filter and how it is installed.
> You can put them in backwards, ask me how I know!
>
> http://www.gmcmhphotos.com/photos/general-pictures/p58270-img-07751.html
> http://www.gmcmhphotos.com/photos/general-pictures/p58271-img-07761.html
> http://www.gmcmhphotos.com/photos/general-pictures/
> p58269-fuel-system-q-jet.html
> http://www.gmcmhphotos.com/photos/general-pictures/
> p58268-q-jet-fuel-filter.html
>
> J.R. Wright
> GMC GreatLaker 18 Year Member
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI 18 Year Member
> 78 Buskirk 30' Stretch
> 1975 Avion (Under Reconstruction)
> Michigan
>

> >
> > A note on the fuel filter inside the 455 or 403 carb.
> >
> > It turns out that there are 2 different filter listed both by Ac Delco
> and Wix. In 1976 GM changed ALL filters of this type in
> all vehicles using
> > that filter. The change was adding a little rubber flapper check valve
> on the entrance side of the filter.
> >
> > Either filter will fit in all years of our 455 and 403 engines with
> Quadrajet carbs.
> >
> > AC Delco GF441 or Wix 33148 is the one without the check valve. (pre
> 1976)
> > AC Delco GF471 or Wix 33152 is the later version with the internal check
> valve and cost $1.80 more. (listed as 1976 and later)
>
> >
> > I did not check out other brands and I also have no recommendation on
> which version to use.
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
So how about someone getting a filter with the check valve and tossing it in a glass baby food jar
full of ethanol laced fuel and reporting back in 3 or 4 months about what has happened to the rubber check valve.
Alternatively, some one could try to find out from WIX Engineering if the flapper
is made from ethanol resistant material.

I think it's great that the WIX filter is made so it can't be installed backwards.
--
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
 
Its tempting to simply eliminate the carb filter and go with an inline external filter as they are difficult to access. many a Qjet has been discarded
with boogered threads when people have done it wrong.
BTW there is [or at least was] a kit to repair that.
I run an View -all pyrex glass filter at a low point before the fuel pump with fuel inlection rated hose and double clamps. THe plastic ones discolor
with age and become opaque.This ebables a visual check of the filter and for water issues as welll as a easy drain point with the electric pump. Never
had a leak; if it did it will leak on hte ground rather than hot engine components.
In the high performence world the filters are almost always removed as they are a fuel restriction at high flow [especialy the pressed brass pettet
type]- more than we will ever need for our application though.
Problem is, stuff can still sloth of at the pump or line and you risk sticking the needle and seat.
For that reason I still have the paper element in place just in case- which with the pre filter should last a long time
--
76 Glenbrook
 
Hi, Chris.

Do you have a source and part number for that Pyrex bowl filter? Sounds like an excellent suggestion.

D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com

________________________________
From: Gmclist on behalf of Chris Tyler
Sent: Saturday, December 16, 2017 15:00
To: gmclist
Subject: Re: [GMCnet] Carb fuel filters

Its tempting to simply eliminate the carb filter and go with an inline external filter as they are difficult to access. many a Qjet has been discarded
with boogered threads when people have done it wrong.
BTW there is [or at least was] a kit to repair that.
I run an View -all Pyrex glass filter at a low point before the fuel pump with fuel injection rated hose and double clamps. The plastic ones discolor
with age and become opaque. This enables a visual check of the filter and for water issues as well as a easy drain point with the electric pump. Never
had a leak; if it did it will leak on the ground rather than hot engine components.
In the high performance world the filters are almost always removed as they are a fuel restriction at high flow [especially the pressed brass pettet
type]- more than we will ever need for our application though.
Problem is, stuff can still sloth of at the pump or line and you risk sticking the needle and seat.
For that reason I still have the paper element in place just in case- which with the pre filter should last a long time
--
76 Glenbrook
 
Mac, I don't recall exactly what I used, but it looks something like a
Summit SUM-230123R:

https://www.summitracing.com/parts/sum-230123r

Generally, these are easy to service and use a fine enough element.

But I also have 10-micron inline metal-can filters back by the tanks (3/8"
hose fittings and much cheaper). This inline filter close to the carb has
not yet needed service in maybe 10 years.

Rick "not clear, but not needing to be" Denney

On Sat, Dec 16, 2017 at 4:18 PM D C _Mac_ Macdonald
wrote:

> Hi, Chris.
>
>
> Do you have a source and part number for that Pyrex bowl filter? Sounds
> like an excellent suggestion.
>
> D C "Mac" Macdonald
> Amateur Radio K2GKK
> Since 30 November '53
> USAF and FAA, Retired
> Member GMCMI & Classics
> Oklahoma City, OK
> "The Money Pit"
> TZE166V101966
> '76 ex-Palm Beach
> k2gkk + hotmail dot com
>
>
>
> ________________________________
> From: Gmclist on behalf of Chris Tyler <
> dtyler11>
> Sent: Saturday, December 16, 2017 15:00
> To: gmclist
> Subject: Re: [GMCnet] Carb fuel filters
>
> Its tempting to simply eliminate the carb filter and go with an inline
> external filter as they are difficult to access. many a Qjet has been
> discarded
> with boogered threads when people have done it wrong.
> BTW there is [or at least was] a kit to repair that.
> I run an View -all Pyrex glass filter at a low point before the fuel pump
> with fuel injection rated hose and double clamps. The plastic ones discolor
> with age and become opaque. This enables a visual check of the filter and
> for water issues as well as a easy drain point with the electric pump. Never
> had a leak; if it did it will leak on the ground rather than hot engine
> components.
> In the high performance world the filters are almost always removed as
> they are a fuel restriction at high flow [especially the pressed brass
> pettet
> type]- more than we will ever need for our application though.
> Problem is, stuff can still sloth of at the pump or line and you risk
> sticking the needle and seat.
> For that reason I still have the paper element in place just in case-
> which with the pre filter should last a long time
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
 
​Chris,
I have run some of our trucks W/o the filer in the carb and rereted it as
pieces of rubber, metal and other debree managed to get into the carb.
Once I show you the easy way to change that filter, it is not bad at all.
Call me ad I'll tell you how.​

On Sat, Dec 16, 2017 at 1:17 PM, D C _Mac_ Macdonald
wrote:

> Hi, Chris.
>
>
> Do you have a source and part number for that Pyrex bowl filter? Sounds
> like an excellent suggestion.
>
> D C "Mac" Macdonald
> Amateur Radio K2GKK
> Since 30 November '53
> USAF and FAA, Retired
> Member GMCMI & Classics
> Oklahoma City, OK
> "The Money Pit"
> TZE166V101966
> '76 ex-Palm Beach
> k2gkk + hotmail dot com
>
>
>
> ________________________________
> From: Gmclist on behalf of Chris Tyler <
> dtyler11>
> Sent: Saturday, December 16, 2017 15:00
> To: gmclist
> Subject: Re: [GMCnet] Carb fuel filters
>
> Its tempting to simply eliminate the carb filter and go with an inline
> external filter as they are difficult to access. many a Qjet has been
> discarded
> with boogered threads when people have done it wrong.
> BTW there is [or at least was] a kit to repair that.
> I run an View -all Pyrex glass filter at a low point before the fuel pump
> with fuel injection rated hose and double clamps. The plastic ones discolor
> with age and become opaque. This enables a visual check of the filter and
> for water issues as well as a easy drain point with the electric pump. Never
> had a leak; if it did it will leak on the ground rather than hot engine
> components.
> In the high performance world the filters are almost always removed as
> they are a fuel restriction at high flow [especially the pressed brass
> pettet
> type]- more than we will ever need for our application though.
> Problem is, stuff can still sloth of at the pump or line and you risk
> sticking the needle and seat.
> For that reason I still have the paper element in place just in case-
> which with the pre filter should last a long time
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
> Its tempting to simply eliminate the carb filter and go with an inline external filter as they are difficult to access.

I would not do that!
I had 2 large inline filters before the carb filter when bringing our new coach home at the begining of this month and I ended up having to change
them all twice on the 1300 mile trip home.
Which reminds me I should probably change them again, cheap insurance.

Fram CG3389

--
Tom Lins
Elkton, FL
77 GM Rear Twin
 
Ethanal is a very great cleaner and it is cleaning the tanks so well, that
even on the coaches that I have been useing have caught me off guard as the
residude from the tank, not particules, have coated the filters and caused
me to need to replace the filters.
Upon examining the filters, there is no sign of particulets, just a slight
residude that plug the filters.
I say, have tools and new filters with you to change on the go.

> > Its tempting to simply eliminate the carb filter and go with an inline
> external filter as they are difficult to access.
>
>
>
> I would not do that!
> I had 2 large inline filters before the carb filter when bringing our new
> coach home at the begining of this month and I ended up having to change
> them all twice on the 1300 mile trip home.
> Which reminds me I should probably change them again, cheap insurance.
>
> Fram CG3389
>
>
>
>
>
> --
> Tom Lins
> Elkton, FL
> 77 GM Rear Twin
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
I would say it depends on the condition of the tanks and lines. I replaced
my tanks with Cinnabar tanks in 2003 or so, and when I dropped them this
year, they were still spotless. I replaced my upstream inline filters at
the same time, and was able to blow through the old ones with nearly no
resistance.

There are many inline filters for 3/8" hoses, but I seek out those rated at
10-15 microns.

The AN-6 filter up by the carb is only 18" from the carb.

Rick "noting that most non-GM carbs didn't have integral filters" Denney

> Ethanal is a very great cleaner and it is cleaning the tanks so well, that
> even on the coaches that I have been useing have caught me off guard as the
> residude from the tank, not particules, have coated the filters and caused
> me to need to replace the filters.
> Upon examining the filters, there is no sign of particulets, just a slight
> residude that plug the filters.
> I say, have tools and new filters with you to change on the go.
>

>

> > > Its tempting to simply eliminate the carb filter and go with an inline
> > external filter as they are difficult to access.
> >
> >
> >
> > I would not do that!
> > I had 2 large inline filters before the carb filter when bringing our new
> > coach home at the begining of this month and I ended up having to change
> > them all twice on the 1300 mile trip home.
> > Which reminds me I should probably change them again, cheap insurance.
> >
> > Fram CG3389
> >
> >
> >
> >
> >
> > --
> > Tom Lins
> > Elkton, FL
> > 77 GM Rear Twin
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
 
Rick,
Where were you able to obtain the Micron ratings of each filters?

> I would say it depends on the condition of the tanks and lines. I replaced
> my tanks with Cinnabar tanks in 2003 or so, and when I dropped them this
> year, they were still spotless. I replaced my upstream inline filters at
> the same time, and was able to blow through the old ones with nearly no
> resistance.
>
> There are many inline filters for 3/8" hoses, but I seek out those rated at
> 10-15 microns.
>
> The AN-6 filter up by the carb is only 18" from the carb.
>
> Rick "noting that most non-GM carbs didn't have integral filters" Denney
>
> On Sat, Dec 16, 2017 at 7:23 PM Jim Kanomata

>
> > Ethanal is a very great cleaner and it is cleaning the tanks so well,
> that
> > even on the coaches that I have been useing have caught me off guard as
> the
> > residude from the tank, not particules, have coated the filters and
> caused
> > me to need to replace the filters.
> > Upon examining the filters, there is no sign of particulets, just a
> slight
> > residude that plug the filters.
> > I say, have tools and new filters with you to change on the go.
> >

> >

> > > > Its tempting to simply eliminate the carb filter and go with an
> inline
> > > external filter as they are difficult to access.
> > >
> > >
> > >
> > > I would not do that!
> > > I had 2 large inline filters before the carb filter when bringing our
> new
> > > coach home at the begining of this month and I ended up having to
> change
> > > them all twice on the 1300 mile trip home.
> > > Which reminds me I should probably change them again, cheap insurance.
> > >
> > > Fram CG3389
> > >
> > >
> > >
> > >
> > >
> > > --
> > > Tom Lins
> > > Elkton, FL
> > > 77 GM Rear Twin
> > >
> > >
> > > _______________________________________________
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> > >
> >
> >
> >
> > --
> > Jim Kanomata
> > Applied/GMC, Newark,CA
> > jimk
> > http://www.appliedgmc.com
> > 1-800-752-7502
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
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> >
> --
> Rick Denney
> 73 x-Glacier 230 "Jaws"
> Off-list email to rick at rickdenney dot com
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
Google told me the Mr. Gasket metal-can filters I bought a couple years ago
are 40 microns, so they will stay on the shelf. The Wix 33033, which
crosses with the Fram G15 and the Luberfiner G3/8, is rated at 20
microns--not quite as fine as I remembered. But it's fine enough as a
primary filter.

But those AN-6 filters at Summit usually have the micron rating in their
product descriptions.

Rick "but they aren't cheap" Denney

> Rick,
> Where were you able to obtain the Micron ratings of each filters?
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
 
> Hi, Chris.
>
>
> Do you have a source and part number for that Pyrex bowl filter? Sounds like an excellent suggestion.
>
> D C "Mac" Macdonald
>
>
> https://www.ebay.com/itm/8-mm-5-16-Universal-Fuel-Filter-Glass-Petrol-Inline-Reusable-Car-Motorcycle/263037801143?_trkparms=aid%3D555018%26algo%3DPL.S
> IM%26ao%3D2%26asc%3D49564%26meid%3De1f9dc7a62a24c1db4bd0a5fa9798dac%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D172471507867&_trksid=p2047675.c100005
> .m1851
>
> Here is a 5/15 one. More common in parts stores is the Spector version with multple size nylon fittings
> I have run one of these typeon all of my carb vehicles
>
> To be more clear, Im not advocating removal of the carb filter ! This is a 'pre-filter' ,if you will
>
>
> ________________________________
> From: Gmclist on behalf of Chris Tyler
> Sent: Saturday, December 16, 2017 15:00
> To: gmclist
> Subject: Re: [GMCnet] Carb fuel filters
>
> Its tempting to simply eliminate the carb filter and go with an inline external filter as they are difficult to access. many a Qjet has been
> discarded
> with boogered threads when people have done it wrong.
> BTW there is [or at least was] a kit to repair that.
> I run an View -all Pyrex glass filter at a low point before the fuel pump with fuel injection rated hose and double clamps. The plastic ones
> discolor
> with age and become opaque. This enables a visual check of the filter and for water issues as well as a easy drain point with the electric pump.
> Never
> had a leak; if it did it will leak on the ground rather than hot engine components.
> In the high performance world the filters are almost always removed as they are a fuel restriction at high flow [especially the pressed brass
> pettet
> type]- more than we will ever need for our application though.
> Problem is, stuff can still sloth of at the pump or line and you risk sticking the needle and seat.
> For that reason I still have the paper element in place just in case- which with the pre filter should last a long time
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
76 Glenbrook
 
I thought a see through glass filter sounded great so I put one on years ago but it was broken by a stone or something. I replaced it with a metal one.

Emery Stora
77 Kingsley
Frederick, CO

>

>> Hi, Chris.
>>
>>
>> Do you have a source and part number for that Pyrex bowl filter? Sounds like an excellent suggestion.
>>
>> D C "Mac" Macdonald
>>
>>
>> https://www.ebay.com/itm/8-mm-5-16-Universal-Fuel-Filter-Glass-Petrol-Inline-Reusable-Car-Motorcycle/263037801143?_trkparms=aid%3D555018%26algo%3DPL.S
>> IM%26ao%3D2%26asc%3D49564%26meid%3De1f9dc7a62a24c1db4bd0a5fa9798dac%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D172471507867&_trksid=p2047675.c100005
>> .m1851
>>
>> Here is a 5/15 one. More common in parts stores is the Spector version with multple size nylon fittings
>> I have run one of these typeon all of my carb vehicles
>>
>> To be more clear, Im not advocating removal of the carb filter ! This is a 'pre-filter' ,if you will
>>
>>
>> ________________________________
>> From: Gmclist on behalf of Chris Tyler
>> Sent: Saturday, December 16, 2017 15:00
>> To: gmclist
>> Subject: Re: [GMCnet] Carb fuel filters
>>
>> Its tempting to simply eliminate the carb filter and go with an inline external filter as they are difficult to access. many a Qjet has been
>> discarded
>> with boogered threads when people have done it wrong.
>> BTW there is [or at least was] a kit to repair that.
>> I run an View -all Pyrex glass filter at a low point before the fuel pump with fuel injection rated hose and double clamps. The plastic ones
>> discolor
>> with age and become opaque. This enables a visual check of the filter and for water issues as well as a easy drain point with the electric pump.
>> Never
>> had a leak; if it did it will leak on the ground rather than hot engine components.
>> In the high performance world the filters are almost always removed as they are a fuel restriction at high flow [especially the pressed brass
>> pettet
>> type]- more than we will ever need for our application though.
>> Problem is, stuff can still sloth of at the pump or line and you risk sticking the needle and seat.
>> For that reason I still have the paper element in place just in case- which with the pre filter should last a long time
>> --
>> 76 Glenbrook
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Still waiting for a answer on check valve/flapper vs non check valve/flapper carb filters on the advantages. Or maybe I missed it in a post?
Thanks, Scott.
--
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi.
Houston, Texas
 
I think the idea behind the check valve is to keep the carb from draining
back into the tank when the engine is off. I just can't imagine that it's
needed in our application--doesn't the mechanical pump already have a check
valve?

I've bypassed both the carb filter and the mechanical pump, but I have an
electric pump that gets fuel to the carb when the ignition is on.

Rick "wondering if the change was driven by another application" Denney

> Still waiting for a answer on check valve/flapper vs non check
> valve/flapper carb filters on the advantages. Or maybe I missed it in a
> post?
> Thanks, Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
 
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