1996 F-150 w/ 5.0L and dual fuel tanks. The truck starts normally and will restart if run for a short period of time, however, when it is driven for any period over around 10-15 minutes, it and shut off, it won't restart. Acts as if it is flooded except it has EFI. Once it sits for 20-30 minutes it fires up normally. Someone told me it could be a fuel pressure regulator. Where is it and how hard is it to replace? Thanks!

 

Does it turn over and not start, or does it not even turn over?

 

It turns over. It acts as though it's flooded and just turns over and over. Let it sit for a while and it starts fine.

 

Have you checked for spark or fuel?

 

It starts and runs for as long as you'd like until you turn it off. THEN it won't resart so I assume it has spark or it wouldn't have started in the first place. It obviously has fuel or it wouldn't have started in the first place. What in the spark/fuel categories would keep it from restarting for only 30 minutes?? Once it rests for a while it always restarts. Thanks!

 

I was wondering if it had fuel and spark when it isn't starting. It could be that something is overheating or wearing out and won't work for a restart.

 

If it were an early 90's I would suspect ignition module on the distributor - but '96 and up was the OBD junk huh? Anyhow - check fuses as a precaution and the pressure regulator is usually on the fuel rail on the engine intake. Depressurize the fuel rail before ever tinkering there - but I've never seen one go bad. Check any vacuum lines and the computerized regulators/sensors that tell the pump how much fuel to allow. But I'd check that you're getting fire at thespark plugs first (when it's in the process of screwing up). Get out your mechanics hot gloves.