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Old 05-20-2014, 04:17 PM   #1
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1988 E350 RV Dual Gas Tank Operation


I have a 1988 E350 for a Class C RV. It has Dual Gas Tanks. Do I need to flip a switch to determine the gas tank that it draws from?

I also found a switch to the left of the steering column with what looks like a steering wheel on it and the letter "SAS." Does anyone know what this switch is for?

Thanks for your assistance.
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Old 05-20-2014, 06:16 PM   #2
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SAS--Self adjusting steering? Sorry I could not resist the jest.

Yes there should be a switch on the dash that is for the gas tanks, unless they took the cheap route and put a lever on the floor beside the drivers seat next to the door. You could take it to a gas station and fill only one tank. If the gauge shows full you know that is the tank being registered, if not then you know it is the other tank. If both tanks are full drive for a while to see if the gauge goes down, if it doesn't and non of the switches make a change it is time to chase wires from their respective tanks to the dash, or take it to the dealer and let them figure it out. Many RV places do not do chassis work so you may end up with a mechanic shop that does work on RVs. I take it you do not have the owner's manual?

Berniece & Russell with LilBit the Netherland Dwarf rabbit who knows she is queen
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2003 Kia Sedona
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Old 05-21-2014, 10:30 AM   #3
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Thanks Grandpere. I hope the steering is not self adjusting!! I do not have the manual and the Chilton's was no help. I know the second tank is full...I just need to know if I have to flip a switch or does it automatically draw when the main tank goes empty. There are two switches under the dash (no lever to be found); the one switch is as described (SAS) and the other is definitely after factory and I believe it is for the generator. When I turned it on, there was much noise back by the generator and a smell of gas. Previous owner of RV was not helpful in guiding me on figuring this all out. The RV place did not know so I will have to see about getting a mechanic to take a peek for me. Thanks again!!

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Old 05-21-2014, 09:06 PM   #4
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Depends on if it is factory.

Toggle switch switches both feed to tank and guage.

Have one back in the yard...switch at 1/4 tank then you have reserve to get gas.
Tony & Lori
1989 Country Coach Savannah SE
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gas, tank

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