Fuel tank selector valve

T

thomas mike

New member
Dec 23, 2009
194
0
0
When I pulled the fuel hoses off the solenoid I forgot to note which hose was on top and which on bottom. Is the aux tank the bottom port or top port?
Thanks
--
Mike Thomas
Troy, MI
77 ex Palm Beach, 77 Royale (rear bath)
 
I made the same mistake with mine.
Been running for 3 years and I still have no clue if it's right.
50-50 chance so it's probably wrong.
--
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
 
> When I pulled the fuel hoses off the solenoid I forgot to note which hose was on top and which on bottom. Is the aux tank the bottom port or top
> port? Thanks

Mike,

Are you are asking about the OE part? (That should be replaced as it is not alcohol compatible.)
Or is this the aftermarket part that is upside down and backwards from the OE?

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
Hi Matt. I'm still trouble shooting the sonlioid in the OE valve. Then I have to decide if I replace it with aftermarket valve and ,then maybe add one
electric fuel pump on the aux hose prior to the valve.
--
Mike Thomas
Troy, MI
77 ex Palm Beach, 77 Royale (rear bath)
 
Fellow Spartan:

From the illustration in the Parts Book, the bottom hose goes to the front tank.

Go State!
--
Mike K.
'75 PB
Southeast Michigan
 
That was when it was new but they could have easily reversed over the years.

Go Blue

Emery Stora
77 Kingsley
Frederick CO

Emery

>
> Fellow Spartan:
>
> From the illustration in the Parts Book, the bottom hose goes to the front tank.
>
> Go State!
> --
> Mike K.
> '75 PB
> Southeast Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Thomas,

After 21 years of GMCing, my unqualified recommendation is to eliminate the
selector valve completely. At least one electric pump is almost a
necessity with today's vapor lock prone fuels. Redundant pumps is even
better. So just eliminate the selector valve, put an electric pump on each
tank, and tee their outputs together. Use the tank selector switch to
select a pump. You'll need a couple of relays for that purpose (see the
link below for my wiring diagram -- which may not be the simplest
possible). The cost of the second pump should be little more than the cost
of the selector valve. You MAY need check valves on the output of the
pumps, dependent upon their designs. My 2 Carter 4070's do not require
them, but just in case I ever have to replace a pump on the road with one
that does need them, I included them anyway. That hasn't yet happened.

http://www.gmcmhphotos.com/photos/data/5494/Dual_Fuel_Pump_Wiring.pdf

By the way, a very capable GMCer just found that the cause of his baffling
engine failures was that the NEW valve he'd installed was sticking between
the two positions. :-(

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com

On Wed, Aug 7, 2019 at 10:12 AM Thomas Mike via Gmclist <

> Hi Matt. I'm still trouble shooting the sonlioid in the OE valve. Then I
> have to decide if I replace it with aftermarket valve and ,then maybe add
> one
> electric fuel pump on the aux hose prior to the valve.
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Royale (rear bath)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
If you get it backwards, the gas gauge reading will be reversed too. You'll be reading the level in the tank you're not removing gas from.
--
Todd Snyder, Buffalo NY
1976 Eleganza II
 
An electric fuel pump installed without at least an inertial cutoff switch and preferably a low oil pressure cutoff switch seems like a recipe for
disaster imho. I keep seeing this topic come up and it's never mentioned. Didn't we just loose a couple members when they were in an accident, hit a
house and burned up in a fire?

An inertial cutoff switch ought to be required with any electric fuel pump installation, just my 2 cents.
--
Todd Snyder, Buffalo NY
1976 Eleganza II
 
Todd,

The wiring diagram for which I provided a link DOES include either a LOP
switch or supply from the alternator. But I agree with you that an
inertial shutoff is desirable -- I've got one laying on my workbench
awaiting installation. After I install it, I'll add it to the diagram.

Thanks for the reminder.

Ken H.

On Thu, Aug 8, 2019 at 1:34 PM Todd Snyder via Gmclist <

> An electric fuel pump installed without at least an inertial cutoff switch
> and preferably a low oil pressure cutoff switch seems like a recipe for
> disaster imho. I keep seeing this topic come up and it's never
> mentioned. Didn't we just loose a couple members when they were in an
> accident, hit a
> house and burned up in a fire?
>
> An inertial cutoff switch ought to be required with any electric fuel pump
> installation, just my 2 cents.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Todd
I have not heard that the fire was caused by gasoline in the motorhome. It was mentioned that there was a propane bottle near the part of the mobile home that was struck but I have not heard as to what caused the fire.

What do you know about it? Have you seen anything more or are you assuming it was caused by an electric fuel pump in the motorhome that it didn’t have a cut off switch?

My motorhome doesn’t have an inertial cut off switch but it is cut off by my fuel injection computer. There are also other ways to do it.

Emery Stora
77 Kingsley
Frederick CO

>
> An electric fuel pump installed without at least an inertial cutoff switch and preferably a low oil pressure cutoff switch seems like a recipe for
> disaster imho. I keep seeing this topic come up and it's never mentioned. Didn't we just loose a couple members when they were in an accident, hit a
> house and burned up in a fire?
>
> An inertial cutoff switch ought to be required with any electric fuel pump installation, just my 2 cents.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
> ... put an electric pump on each
> tank, and tee their outputs together. Use the tank selector switch to
> select a pump...

Ken, do you still use the mechanical fuel pump?
--
Stephen Brenton - 1973 Painted Desert 23ft
Round O, South Carolina. The Lowcountry.
 
No, and I discourage connecting an electric pump through a mechanical one.
Having only a thin moving membrane between gasoline and my engine oil
scares me.

Ken H.

On Fri, Aug 9, 2019, 17:12 stephen.brenton--- via Gmclist <

> > ... put an electric pump on each
> > tank, and tee their outputs together. Use the tank selector switch to
> > select a pump...
>
>
> Ken, do you still use the mechanical fuel pump?
> --
> Stephen Brenton - 1973 Painted Desert 23ft
> Round O, South Carolina. The Lowcountry.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Isn't there one - iff Ford trucks maybe? which swaps both feed and return?

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
 
This would be the move, would it not?:

https://www.amazon.com/Selector-Valve-Diesels-Replaces-6C3Z-9189/dp/B07GT7LS19/ref=asc_df_B07GT7LS19/?tag=hyprod-20&linkCode=df0&hvadid=312484993382&hvpos=1o4&hvnetw=g&hvrand=5594382446897765080&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011014&hvtargid=aud-801381245258:pla-569853388922&psc=1

--johnny

--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
 
You must log in or register to reply here.
Applied GMC
GMCMI Spring 2026 Rally

Share this page

Share this page
Top Bottom
Back