Question about 1990 Ford F150

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Dual tank only runs on one tank

It has 2 gas tanks the one in the front is the only one it runs on and the fuel level gage doesnt work on that tank however when i turn the switch to the rear tank the fuel level gage works but the engine stall lack of fuel i guess. and als theres some kind of pressure on the rear tank because when you loosen the gas cap fuel alot comes out i could use some help

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  • Ford Master
  • 4,369 Answers

There is an electric valve that switches from one tank to the other. it switches the gauge too. It is malfunctioning and pumping fuel from one tank to the other instead of the engine. I think there wa a recall for this. Call any Ford dealer and give him your 17 digit VIN # and they can check for open recalls. Recalls never expire and the dealer will repair for free if there is a recall.
good luck

Posted on Jan 11, 2009

  • gerry bissi Jan 11, 2009

    89S70 - Safety Recall - 1990 F-150/250/350 with Dual Fuel Tanks
    (Published: 09/1989)



    Affected Vehicles

    Certain 1990 F-Series light trucks equipped with dual fuel tanks built from July 24 thru August 1, 1989 at the Michigan Truck Plant.
    Reasons For Recall

    The fuel line assembly connectors (fuel supply and return line) on a small number of these trucks may be crossed. If this condition exists, there is a potential to transfer fuel from one tank to the other possibly resulting in fuel overflow and spillage during engine operation. In the presence of an ignition source, a vehicle fire could occur.



    Parts Requirements

    Parts will not be direct shipped for this recall. Order your parts requirements through normal order processing channels.








    SERVICE PART NUMBER
    DESCRIPTION
    APPLICATION
    CLASS

    F0TZ-9S278-B
    Fuel Line Assembly
    117"/139" Wheel Base
    CG

    F0TZ-9S278-C
    Fuel Line Assembly
    133"/155" Wheel Base
    CG

    F0TZ-9S278-D
    Fuel Line Assembly
    137" Wheel Base
    CG

    F0TZ-9S278-E
    Fuel Line Assembly
    161" Wheel Base
    CG





    Inspection/Replace Fuel Line Assembly


    1. Be certain that there is fuel in each tank.
    2. Start the engine and run for two minutes using aft-axle fuel tank.
    3. Repeat using mid-ship fuel tank.
    4. If the engine fails to continue running on either tank, replace fuel line assembly. (Reference Shop Manual, Section 24-50 for procedure)
    5. CAUTION: Be sure all fuel line routing clips on the new fuel line assembly are secure to the frame side rail and rear tank cross member.
    6. Check entire fuel system for leaks.
    7. Complete Form 1864 and release truck from delivery hold.

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8w-40-2 106001316
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If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
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then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
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2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

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