fuel tanks

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Jun 6, 1999 | 10:16 AM

jnbutl

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Joined: Jun 1999

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fuel tanks

I have an 87 F250 with a 460 and electric in-tank fuel pumps. It runs out of fuel when I switch tanks. Both tanks are full, the fuel pumps in both tanks are working, and the selector valve is new. The fuse is okay also.

Any ideas?

Jun 7, 1999 | 11:52 AM

Phillip Guidry

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Joined: Jun 1999

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fuel tanks

If your engine is EFI, there should be a hi-pressure pump on the frame,along with the low-pressure pumps in the tank.Now,if you can run on one tank only,and both in-tank pumps are working,here is what to check: {1}No voltage to frame pump when selecting inoperative tank.{2}Kinked fuel line from inoperative tank to selector valve.{3}Defective selector switch or wiring.{4}Broken impeller on fuel pump in tank.
Phillip

Jul 14, 1999 | 11:52 AM

Ned Little

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Posts: n/a

fuel tanks

I have what I believe to be the same problem that you are having. Both tanks are full and when I switch from one tank to another it runs out of gas. I can then switch back and it still will not run. I have to bleed the mechanical switch located on the left frame just behind the high pressure fuel pump. I was having a fuel pump problem but misdiagnosed it and replaced the mechanical switch instead. Ever since I have been having this problem and haven't been able to figure it out yet. I believe that there must be a way of bleeding this switch that I don't know about but need to do.