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Switching to Auxiliary Fuel Tank [message #186097]

Mon, 01 October 2012 15:36

Bob M

Messages: 100
Registered: August 2005
Location: Carlisle, PA

Karma: 0

Senior Member

It is my understanding that one of my fuel tanks is actually an auxiliary tank and I can switch to it by pressing the button on the dashboard. But I really don't know how it is supposed to work. I understand that fuel is dispensed equally from both tanks until they reach 1/4 full and then fuel is dispensed from the primary tank. What happens next? If i let the primary tank go to 1/8 full, can I push the button and see my guage register 1/4 again because that's what remains in the secondary tank? When running on the primary tank do I still have 1/4 in the secondary tank? Thanks for any enlightenment you can provide.
Bob Moss
'77 Eleganza II

Bob Moss

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Re: [GMCnet] Switching to Auxiliary Fuel Tank [message #186100 is a reply to message #186097]

Mon, 01 October 2012 15:40

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

read here
http://gmcmotorhome.info/tank.html

gene

On Mon, Oct 1, 2012 at 1:36 PM, Bob Moss <fums6@aol.com> wrote:

>
>
> It is my understanding that one of my fuel tanks is actually an auxiliary
> tank and I can switch to it by pressing the button on the dashboard. But I
> really don't know how it is supposed to work. I understand that fuel is
> dispensed equally from both tanks until they reach 1/4 full and then fuel
> is dispensed from the primary tank. What happens next? If i let the primary
> tank go to 1/8 full, can I push the button and see my guage register 1/4
> again because that's what remains in the secondary tank? When running on
> the primary tank do I still have 1/4 in the secondary tank? Thanks for any
> enlightenment you can provide.
> Bob Moss
> '77 Eleganza II
> --
> Bob Moss
> _______________________________________________
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--
Gene Fisher -- 74-23,77PB/ore/ca
�Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: [GMCnet] Switching to Auxiliary Fuel Tank [message #186109 is a reply to message #186100]

Mon, 01 October 2012 16:32

WD0AFQ

Messages: 7111
Registered: November 2004
Location: Dexter, Mo.

Karma: 207

Senior Member

Bob, I had a guy in Southern Illinois switch my lines. Caused me to run out of gas once at Applied GMC. Could not figure out what was wrong til I got them switched back. You have it pretty well figured out. Back tank is primary. I flip my switch often to keep it working. Occassionally I will run the GMC til it runs out of gas in primary and then flip it. Go up a hill and it will run back into the primary and I switch it back. I only do this when I am near home and know where the gas station is. You should notice both tanks kinda going down at same time if you flip switch back and forth.
Dan

3 In Stainless Exhaust Headers One Ton All Discs/Reaction Arm 355 FD/Quad Bag/Alum Radiator Manny Tran/New eng. Holley EFI/10 Tire Air Monitoring System Solarized Coach/Upgraded Windows Satelite TV/On Demand Hot Water/3Way Refer

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Re: Switching to Auxiliary Fuel Tank [message #186111 is a reply to message #186097]

Mon, 01 October 2012 16:37

chasingsummer

Messages: 434
Registered: May 2011
Location: asheboro, nc

Karma: 0

Senior Member

i have been switching to aux tank when my low fuel light comes on, then i assume i can either get gas in 50 or so miles, or may have to walk to get gas. i have seen that when my low fuel light comes on my aux by gauge has little under a quarter in it and main is real close to pointing to e

brian asheboro, nc 75 eleganza, 74 build 119k miles and counting, DOG HOUSE

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Re: Switching to Auxiliary Fuel Tank [message #186119 is a reply to message #186111]

Mon, 01 October 2012 17:10

WD0AFQ

Messages: 7111
Registered: November 2004
Location: Dexter, Mo.

Karma: 207

Senior Member

I rarely run mine below half full. I find it good to get out of the coach every couple hundred miles just to check things and take a break. Great time to gas up again.
Dan

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Re: Switching to Auxiliary Fuel Tank [message #186176 is a reply to message #186097]

Tue, 02 October 2012 07:32

mschultz

Messages: 113
Registered: September 2010
Location: Maple City, MI

Karma: 0

Senior Member

Thanks for the reminder. This summer after a long trip from Mo. back to Michigan, we were getting low on fuel. I had never used the aux. switch. The next exit was coming, so I was sure to make it. However the exit was under construction and the next one was 15 miles. OK, so switched the aux. switch, no problem, right. Wrong, you would have thought I had hit the kill switch. Back on to the main tank. Made it to the next exit, rolled through the stop sign and fortunately the gas station was down hill from there. Had to time it just right to hit the pump on the correct side without power. Quite a accomplishment. Glad I had the reserve brake boaster tank. Anyway, got to get that fixed, your question reminded me to put it on the list.

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