full size fuel system

[clvanhorn]

hey guys, i recently acquired a 1991 f150 as my dd. 4.9 5sp 2wd. short box dual tank. truck has been running kind of funny, and today it wouldn't start. it does turn over, but will not fire. i think the problem is in the fuel system because my fuel pumps are not shutting off after a few seconds like normal, they just run until i turn the key off. this problem occurs with both tanks. wondered if any of you guys have some input on this. only parts changed recently is the fuel filter, but it ran fine for a week after that change. TIA

 

[martin]

It shouldn't matter if the pump runs all the time (I'm not saying it's right, just that it shouldn't affect the running). Pull a plug and see if you have spark, then listen with a stethascope on an injector to see if they are pulsing.

 

[clvanhorn]

thanks guys for your help... turned out to be the fuel pump relay... if anyone else has this problem, remeber to reset your computer by unhooking the battery for a little while to let the changes take place in that pos