96 F250 rear fuel tank bleed fuel to front tank

96 F250 5.4 with dual tanks. The forward tank sending unit has evidently failed. It does not read fuel level at all.

Also, when running on the rear tank, the fuel leaches into the front tank. I can run the front tank dry, flip the switch, and after 25-50 miles, flip back top the front and run for a while.

I plan on keeping the truck for a couple more years, and would like to fix the problem.

Any advice is appreciated.

Thanks, MGP

Reply to
floydlawson
Loading thread data ...

The fuel is not "leaching" into the front tank. What is happening is, when you are switched to the back tank, the return line valve is not closing off completely on the front tank return port. Replacing the defective electric switch over valve may solve both problems. It did for me on an older model!! Tom J

Reply to
Tom J

Sounds like the solution. The fuel indication problem was intermitent at first but is now constant. The amount of fuel returning to the forward tank seems to have increased since the problem first appeared. SO perhaps the valve has failed entirely now.

Please tell me the valve is not IN the tank :(

MGP

Reply to
floydlawson

Mine was mounted inside the frame near the front tank. Be sure you mark all the pipes/hoses well and get them back on the same port on the new valve!! Tom J

snipped-for-privacy@floydthebarber.com wrote:

Reply to
Tom J

The valve is located inside the frame near the front tank. It has 6 ports, so if you tackle the job yourself, make sure you mark all the parts well, so you get it put back together correctly!!

Tom J

Reply to
Tom J

I located a device mounted to the frame with only two lines going into it. It is obviously fuel system related and has an electrical connecter. Could this be a newer design with less outlets? I could NOT find anything in the fuel run with multiple connecting lines.

Thanks for your help, MGP

Reply to
floydlawson

On Mon, 11 Feb 2008 21:55:04 -0500, floydlawson rearranged some electrons to say:

No, that's a fuel pump.

Reply to
david

I thought that might be the pump. So I am assuming the failed valve is in the tank then, unlike Tom's on his older vehicle.

MGP

Reply to
floydlawson

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.