Question about 1992 Ford F250

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Truck wont run as there is no fuel pressure at the rail. When I turn on the front fuel pump it appears to fill the back tank and come out the filler tube. I turn on the back fuel pump and it does the same, comes out the back filler tube. what is the possible problem

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The switching valve has gone bad forgot exactly what ford called it but it might be tank isolater what is does is block which ever tank that is not in use to prevent what is happening to you the valve is stuck in neutral position causing no restriction liquid follows path of least resistance cut front tank on pump pushes fuel out gets to valve and instead of going to engine and building pressure it just runs over in the rear tank path of least resistance this valve should be frame mounted some where between tanks have seen on rear crossmember to

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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I have no gas running to the engine from the front tank, and apparently have gas filling into the front tank from the rear tank. I can only use the rear tank. The switch is set for the rear tank and when I...


Hi:
I have had the exact problem on my ford truck, and fixed it. There is a tank feed shuttle valve mounted to the drivers side frame rail that is the most likely suspect. It operates by fuel pressure and when it fails, it fails so the front tank doesnt work.

It is worth mentioning that there are three fuel pumps on your truck, each fuel tank has a small low pressure pump inside the tank, and there is a high pressure pump located on the drivers side frame rail too, just before the fuel filter.

The front in the tank pump could be bad, too, but most likely the shuttle valve is the problem.

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The fuel pump is serviced as part of the fuel pump module. The fuel pump module is installed in the top of the fuel tank and contains the electric fuel pump, fuel pump reservoir, inlet strainer, fuel gauge sending unit, fuel supply line and pressure regulator. The inlet strainer, fuel pressure regulator and level sensor are the only serviceable items. If the fuel pump requires service, replace the fuel pump module, using the following procedure:

  1. Remove the fuel filler cap and properly relieve the fuel system pressure.
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  6. Thoroughly clean all parts. Wipe the seal area of the tank clean. Place a new O-ring in position on the pump module.
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Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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