Fuel sender question

[d c *mac* macdonald]

I thought your wife was also an engineer, Ken! I figured she'd remember #1 and forget the others!

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________________________________
From: Gmclist on behalf of Ken Burton
Sent: Saturday, December 10, 2016 00:26
To: gmclist
Subject: Re: [GMCnet] Fuel sender question

> Thanks Ken. I'll do 3 first.

OK, but you were suppose to #1 and #2 first.

You sound like my wife. I'll ask her for 3 things from the kitchen. She will show up with #3 and forget #1 and #2.

Good Luck on your projects.

Ken B.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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[Jim Hupy]

A couple of quirks about the fuel system. Fuel can and does transfer
between tanks while driving. Long uphills will fill the main tank, while
prolonged downhills will fill the Aux. So the gage sender in the selected
tank changes quite a bit. If the world were truly flat, it would not be
much of a problem. I worried about this one for a bit, and then wised up. I
start each trip from home with full tanks. And my coach gets about 10 miles
per gallon, 50 gallons will run the coach over 400 miles with reserve. That
figures to 8 hours of seat time, too much for my bony old butt. So, I just
drive 4 hours, Stop and refuel. Don't much care about what the gages say.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> > I am about to drop the tanks and re hose and refresh the fuel system.
> This is why I'm asking, so I can take the time to fix this too while
> > they're down. or try to, any way.
> >
> > if, in a new system, it worked that the main and aux tanks read exactly
> the same until less than a 1/4 tank, and mine are reading differently at
> > 1/2 to 3/4, then I can assume there is something amiss with my system.
> >
> > if this (different readings) cannot be because there are different
> amounts of fuel in the different tanks, because they self level, then I will
> > again assume there is something amiss with my system.
> >
> > are my assumptions correct?
> >
> > thanks again.
> If no one has messed with the fill plumbing or the venting, on level
> ground, the tanks will stay at the same level until they drop below the fill
> inlet level. Then the pump will pull from whatever tank is selected until
> it is empty, or you select the other tank. The point where they stop
> "self-leveling" is around 6 gallons in each tank.
>
> If your system is stock, your assumptions are correct. Most likely what is
> "amiss" in your system is a float or two, or a potentiometer or two, or
> connections, or some combination of those.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[robert mueller]

Jim,

"That figures to 8 hours of seat time, too much for my bony old butt. So, I just
drive 4 hours, Stop and refuel. Don't much care about what the gages say."

I agree 110%!

And MY butt is VERY well padded1

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
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 James Hupy
Sent: Tuesday, December 13, 2016 1:08 PM
To: gmclist
Subject: Re: [GMCnet] Fuel sender question

A couple of quirks about the fuel system. Fuel can and does transfer
between tanks while driving. Long uphills will fill the main tank, while
prolonged downhills will fill the Aux. So the gage sender in the selected
tank changes quite a bit. If the world were truly flat, it would not be
much of a problem. I worried about this one for a bit, and then wised up. I
start each trip from home with full tanks. And my coach gets about 10 miles
per gallon, 50 gallons will run the coach over 400 miles with reserve. That
figures to 8 hours of seat time, too much for my bony old butt. So, I just
drive 4 hours, Stop and refuel. Don't much care about what the gages say.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> > I am about to drop the tanks and re hose and refresh the fuel system.
> This is why I'm asking, so I can take the time to fix this too while
> > they're down. or try to, any way.
> >
> > if, in a new system, it worked that the main and aux tanks read exactly
> the same until less than a 1/4 tank, and mine are reading differently at
> > 1/2 to 3/4, then I can assume there is something amiss with my system.
> >
> > if this (different readings) cannot be because there are different
> amounts of fuel in the different tanks, because they self level, then I will
> > again assume there is something amiss with my system.
> >
> > are my assumptions correct?
> >
> > thanks again.
> If no one has messed with the fill plumbing or the venting, on level
> ground, the tanks will stay at the same level until they drop below the fill
> inlet level. Then the pump will pull from whatever tank is selected until
> it is empty, or you select the other tank. The point where they stop
> "self-leveling" is around 6 gallons in each tank.
>
> If your system is stock, your assumptions are correct. Most likely what is
> "amiss" in your system is a float or two, or a potentiometer or two, or
> connections, or some combination of those.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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[Ken H.]

Me too, Jim. And as a backup to that, I always drive on the MAIN tank.
Since my EFI returns fuel to the AUX tank, it's always got reserve fuel in
it. If I don't stop for fuel soon enough and the engine starts to miss, I
select AUX and head for the nearest service station.

Ken H.

> A couple of quirks about the fuel system. Fuel can and does transfer
> between tanks while driving. Long uphills will fill the main tank, while
> prolonged downhills will fill the Aux. So the gage sender in the selected
> tank changes quite a bit. If the world were truly flat, it would not be
> much of a problem. I worried about this one for a bit, and then wised up. I
> start each trip from home with full tanks. And my coach gets about 10 miles
> per gallon, 50 gallons will run the coach over 400 miles with reserve. That
> figures to 8 hours of seat time, too much for my bony old butt. So, I just
> drive 4 hours, Stop and refuel. Don't much care about what the gages say.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>

>

> > > I am about to drop the tanks and re hose and refresh the fuel system.
> > This is why I'm asking, so I can take the time to fix this too while
> > > they're down. or try to, any way.
> > >
> > > if, in a new system, it worked that the main and aux tanks read exactly
> > the same until less than a 1/4 tank, and mine are reading differently at
> > > 1/2 to 3/4, then I can assume there is something amiss with my system.
> > >
> > > if this (different readings) cannot be because there are different
> > amounts of fuel in the different tanks, because they self level, then I
> will
> > > again assume there is something amiss with my system.
> > >
> > > are my assumptions correct?
> > >
> > > thanks again.
> > If no one has messed with the fill plumbing or the venting, on level
> > ground, the tanks will stay at the same level until they drop below the
> fill
> > inlet level. Then the pump will pull from whatever tank is selected until
> > it is empty, or you select the other tank. The point where they stop
> > "self-leveling" is around 6 gallons in each tank.
> >
> > If your system is stock, your assumptions are correct. Most likely what
> is
> > "amiss" in your system is a float or two, or a potentiometer or two, or
> > connections, or some combination of those.
> > --
> > 73 23' Sequoia 4 Sale
> > 73 23' CanyonLands Parts Unit 4 Sale
> > Upper Alabama
> > "Highest price does not guarantee highest quality."
> >
> > _______________________________________________
> > 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:
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