Please Help, I can't figure out my fuel system problem....

[b33cpe]

I have a 1984 ford f-250 460 4x4.
i was not getting enough gas to the carburator causing the truck to only run for 10-15 seconds, i give it gas when it starts to die but it still dies. i ran an alternate electric fuel pump outside the truck from the tank switch over(i have two tanks), and the truck runs perfect.
I have changed the fuel return valve, fuel relay, oil pressure activated fuel pump shutoff switch, oil pressure gauge sending unit, fuel pump, rebuilt the carburetor, adjusted the floats, checked the Interia switch and all the fuses.


Now my gas gauge is not working. I was told to change the fuel tank switch over valve, so i did that today, and now the truck wont start at all. before it would run for 10 seconds and then die, any ideas on what else it could be?

[merlynr]

Did you change the fuel filter?

[Bear 45/70]

Run a jumper wire from the positive terminal of the battery to the wire on the rear small terminal on the starter solenoid. The pump should run al long as the wire is connected in whichever tank you have selected. If the pump runs, start the truck, if it stays running the problem is either a blown fuse or you may have an alternator issue.

[DWB78F250]

I had a 1994 F-150 that did the something like that. My problem turned out to be the electrical conections on top of the fuel tank. I would check all the conections for your switch. Maybe a bad ground wire. Or you just might have a dirty fuel filter.

[lewislynn]

I had the same problem on my motorhome (87 460) the fuel pump circuit also goes through some vacuum switches on the intake manifold.

Ny problem was a connector from or to one of the vacuum switches melted on the intake manifold.