Question about 1990 Ford F150

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1990 ford f150 has dual tanks. gas pumps from rear tank to front

When truck is running it pumps from the rear tank to the front tank and from the front tank to the rear tank

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  • Anonymous Mar 18, 2014

    Could I get a schematic of the hoses between the front and the rear reserve tank, of a1993 F150 pickup truck the front tank becoming pressurized gas is being forced out of the neck while the truck is running

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See these two threads for more info, I've heard of this happening before, in fact at one time there was a recall from Ford regarding this exact issue - http://www.fordf150.net/forums/viewtopic.php?p=227833 - http://www.fordf150.net/forums/viewtopic.php?p=46861

Posted on Feb 12, 2009

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I have a 4.9L with dual tanks run off rear tank but will not run off front tank


Well, each tank has an assist pump insidfe it to supply the main hi-pressure pump on the left frame rail(usually) of your truck.Probably the assist pump in the tank that6 doesn't work has gone bad or started pulling air. don-ohio

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1987 f150 302 the truck runs only on front tank, but it pumps the tank into the rear tank then the rear tank overflows and you run out of fuel in the front, need a cheap quick fix to get through until the...


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Apr 10, 2011 | 1990 Ford F150

1 Answer

1991 FORD F150 DUAL TANKS,GAS LEAKING OUT OF ONE TANK FROM ( GAS CAP )


Have the same truck and had the exact same problem. Mine spilled out the front tank. Ford did a recall on this problem. They put valves on the lines outside the tanks. Mine had already been done so that was not the problem. The pumps have valves inside for the return lines. I replaced the rear pump, didn't fix it. Replaced the front pump and Voila ... it was fixed. Bad valve in the front pump return line.

Oct 07, 2010 | 1991 Ford F150

1 Answer

Dual tanks on 1990 Ford F150


It should not cause no problems but instead of removing the tank leave it in the truck take out all the fuel in the tank and jus discontinue use of it. This will save you alot of time and trouble and i also suggest that if anyone besides you drives this vehicle then i would put a locking gas cap on it so it cant be accessed at anytime except by you.

Jun 23, 2009 | 1990 Ford F150

1 Answer

Ford F150 1990 truck - Gas was leaking from the front tank. Replaced the grommit and now it is pulling the gas from the rear tank to the front an overflowing out of the nozzle where the gas cap is.


You definately need to get the truck serviced soon. To just guess at it, the balance pump isnt shutting down. The guage may not connected or moving freely.

Jun 18, 2009 | 1990 Ford F150

2 Answers

1992 f-150 dual gas tanks tank closest to cab of truck pumps gas out the fuel cap


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Jun 02, 2009 | 1992 Ford F150 SuperCab

1 Answer

I have a 1991 Ford F150 4 x 4 inline 6 4.6L. Dual


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Apr 17, 2009 | 1991 Ford F150

1 Answer

How do I remmove secondary fuel tank which is leaking?


there should be two straps holding the tank in place,,,,if you remove them the tank should drop down to where you can disconnect the feeder hose and go from there

Feb 20, 2009 | 1990 Ford F150

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