1991 ford f150 slow to start in morning

Asked by Jun 21, 2013 at 10:15 PM about the 1991 Ford F-150 XLT Lariat 4WD Extended Cab LB

Question type: Maintenance & Repair

takes about 5 min in morning before truck starts fuel pump runs for 5 min or so then shuts off and truck will start. fuel pump pumps over a pint in 20 seconds, fuel pressure @ 38or so pounds in less than 1 second has new fuel relay what's next?? motor is 5.0

2 Answers

116,565

Found this thread discussing the same problem. It has some info that you might find helpful. http://www.fordf150.net/forums/viewtopic.php? t=78779

1 of 1 people found this helpful.
26,285

In my experience, the most common cause for this is a faulty check valve in the fuel pump allowing all of the fuel to drain back to the tank overnight. Your pressure and delivery are good, it just sounds like you're having to refill the fuel system whenever you park it for a cold soak. A gauge left on the schrader valve overnight will answer this one. There should be a considerable amount of residual fuel pressure after an overnight soak (1/2 to 3/4) . BTW - your fuel pump should only run for 3 seconds at a time with the engine off. 5 minutes is an eternity and if that is correct, you have a sticking fuel pump relay too.

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