IM WORKING ON A 2005 FORD F250 4 WHEEL DRIVE ...

2005 Ford F-250

Tiny

thomasnchy

December, 8, 2012 AT 2:02 AM

I'm working on a 2005 Ford F-250 4 wheel drive with 5.4L 3v gas engine. On occasion it will not start, it will crank over fine but not start. Usually after 2 or three key-off, key-on sequences it starts. More often than not it will start first time.
I have replaced the fuel filter, fuel pump, and pump driver. I listened to the bottom of the tank while a friend cycled the ignition to "on" and the pump was."On'."On"."On". Off. Off."On"."On". Etc. No rhyme or reason. My next point of attack is the crankshaft position sensor. Unless someone has a better idea?

Thanks

FOUND 2318 RELATED QUESTIONS

3 Answers

Tiny

ASEMaster6371

December, 8, 2012 AT 2:04 AM

What is the fuel pressure?

Roy

Tiny

thomasnchy

December, 8, 2012 AT 2:19 AM

I was only able to read it with my scanner at idle and it was @40psi, after I replaced the pump. I havent hooked it back up since I installed the driver.

Tiny

thomasnchy

December, 8, 2012 AT 2:30 AM

When the pump cycled to "on" I had him go ahead and start the truck and it ran fine at idle and wot. When I didn't here the pump kick on the truck (of course) would start but die shortly- maybe 5-6 seconds rough idle.

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