Question about 1996 Ford F150 Regular Cab

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I have a 96 f150 with 2 fuel tanks the back fuel tank somehow bleeds fuel into the front tank and the front tank is now full but when I switch over to the front tank the truck runs out of gas. Are these known to malfunction?

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  • Ford Master
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Yes,Ford sells the fix,a check valve that just snaps on to the fuel line .

Posted on Nov 14, 2010

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1 Answer

Fuel runs from back tank to front sometimes


If your driving a ford truck the fuel pump assy that is in the tank that is recieving the gas is leaking and allowing fuel to enter. Ford uses a valve in the fuel pump assy that is activated when fuel pressure is applied to it and it opens a port and allows the excess fuel to return back to the tank. They do not use a switching valve between tanks just whichever pump is activated allows fuel to return to that tank. When this valve fails fuel is returned to this tank all the time, pumping it from one tank to the other.
If you dont have a Ford the switching valve assy. is probably faulty.

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1 Answer

I have a 2000 gmc 3500hd,the fuel gauge stopped at half way and i run out of fuel. the rear tank is not sending fuel to the front tank?


David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.

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1 Answer

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you will need to replace the front intank fuel pump. the check valve in the pump has failed and the rear pump is pumping fuel into other tank ,

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2 Answers

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Your truck has a mechanical switch that may not be working. Check it for power and ground.

One of the problems with 2 tanks is a lot of folks only run off of one and then you can get a sludge build up and could have a plugged pick up line.
Try this remove the fuel cap for the front tank.
Disconnect the front tank fuel line from the switch valve.
If you are not getting a good flow of fuel using low pressure air no more than 25 to 40 PSI blow back into the tank.
Now do you have fuel flow?
Your switch valve may be plugged on the front tank side - If you are getting fuel to the switch valve and not through it I would replace the valve.
You may also have a bad dash switch
Hope this helps Please leave a testimonial if it does
Thanks
Scott

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1 Answer

1995 F150 (6 cyl) has duel tank fuel issue


To fix the problem you need to replace the switch valve on the frame rail. They shouldn't bleed into one another. When the system is working right they are independent and controlled by the switch on the dash.

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1 Answer

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The Ford trucks were recalled for the tank switch replacement. Somehow the switches would pump fuel from one tank to the other. This would cause the one tank to overflow and or result in a fire from hot exhaust temps coming into contact with the fuel. Check the dash tank switch. It is probably bad.

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1 Answer

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hi your symptoms suggest that you have slight blockage either in fuel line or most likely at point where rear tank fuel line enters the switch over reason ? you say runs ok on rear tank at 55mph? but when demand for more fuel / speed above that pump /engine cannot deliver ? due to narrowing of fuel line (tuberculation) so check flow from r/tank and for any debri inside?

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1 Answer

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if gauge is reading over full sounds like no ground wire could be broken

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