85 F250 Starting Problems

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Apr 23, 2010 | 10:30 PM

Punisher327

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85 F250 Starting Problems

I have an 85 f250 with a 460 the truck will crank and after about 20 seconds of cranking finally get some fuel to the carb but it will only run about 3-5 seconds

Apr 23, 2010 | 10:48 PM

Franklin2

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From: Virginia

Your truck has electric pumps in the tanks. They get power directly from the starter solenoid during cranking, but receive power from a fuel pump relay when the engine is running. The fuel pump relay is powered from a oil pressure switch.

I would hot wire the pump(s) and see if it will run.

Apr 23, 2010 | 10:57 PM

Punisher327

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ok I'll try that but its the same case with both tanks I've replaced the pump relay and I'm showing oil pressure while cranking is it possible that the tank selector switch could be bad?

Apr 23, 2010 | 10:59 PM

fepowerguy8

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it is possible, it does seem to be a fuel problem

Apr 23, 2010 | 11:02 PM

Punisher327

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its definitely a fuel problem cause after the long cranking I can see gas in my clear fuel filter then I see it empty

Apr 23, 2010 | 11:04 PM

Franklin2

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From: Virginia

So it seems the power from the starter system is getting through to the pump, and I believe that has to go through the selector switch and the crash safety switch. So that kind of rules out the switch for the moment I think.