Question about 1991 Ford F250

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She cranks, then catches but will not stay lit. acts like there is no fuel, but there is fuel at the discharge side of the filter

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You need to know how much fuel is actually getting to the injectors. if it's throttle-body injected you should be able to observe a basically uniform conical fuel spray from below the injectors in the throttle body. if multiport injected, you can't see injector spray, but you can attach a fuel pressure gauge to the schrader valve in the fuel rail to see if the fuel pump is putting out adequately. if you don't have a gauge, my favorite redneck method (this is technically a bad idea, so please use all common sense if you do smoking, no open flames, keep all spark plug wires attached, etc.) is to depress the plunger on that schrader valve w/ a small screwdriver for about half a second; if you get pretty wet w/ gas then your pump's probably ok, but you might have a problem where the injectors aren't getting the proper signal from the computer

Posted on Sep 29, 2009

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