Hey guys. I'm the proud owner of a 2002 F-250 powered by a 5.4L modular. I looked through this forum for any advice on my problem but I can only find threads involving loss of power down to 25%. I have COMPLETE loss of power at random times. Normally it seems to be happening when at steady speed of between 25 and 50 mph. My engine will just stop with no warning. All electrical stays intact but engine goes ca-put leaving me coasting down the road not noticing anything until I compress the gas pedal. I mean, I'm tellin ya, no spit, no sputter, no bog down, no loss of up to 25%. Nothing. I'll turn the ignition over and sometimes it will crank on the first turn but other times it will turn over and over. Today, when it happened, I got under the hood and let off some pressure via the relief valve on the fuel rail. I had turned it over about 3 times with no luck but after I bled fuel rail it cranked right up and I had no more issues all the way to work (20 miles).
I would like to add that I installed a brand new IAC approximately 2 months ago and also had a Ford tech change 2 COP's and a spark plug. A new alternator and fuel pump were installed 6 months ago.
Does this sound like some sort of fuel pump problem to any of you or do you think I have some sort of electrical issue going on? System isn't throwing any codes and I'm assuming this is because I have no maintenance lights on.

I'm lost guys. Y'all came through for me with the IAC. I'm in need of some expertise again. What ya got????

KEEP IT FORD!!!!!

 

So, when it shut down you did have pressure at the fuel rails?

If so, I would take a hard look at the crankshaft position sensor.....or is it camshaft position sensor?

 

I know there was pressure when I bled it but that was after trying to turn it over a few times. I guess I need to go straight to the bleed valve when it shuts off just to make sure, huh?

 

Probably, but usually fuel starvation issues do not have sudden shut down events, the loss is gradual or the truck stutters. A sudden shutdown is usually ignition related, although there are exceptions.

 

I had an older Olds Cutlass that did just what you describe. No codes either. In the end, it was as redford said, the Crank/Camshaft Position Sensor. Give it a think!

 

Well, for an $18 fix it doesn't sound like a bad idea just to change the CMP anyway. Thanks! I'm gonna give it a shot and get back to ya.

 

Also check the fuse that controls the fuel injector relay and the relay itself.

 

Alright, before I started messing with anything I drove my truck for another week to see if I could have a little better understanding as to what the problem was. I am now 98% sure that its a fuel issue. Sadly, my baby left me on the side of the road the other day. I'm not getting fuel to the engine and all the fuses and relays are good.

My question now: Is there any way to test the fuel pump to find out if I can save myself $100 by just replacing only the pump and strainer? The entire unit is looking at running me $200 and that comes with pump, strainer, sending unit, etc. Is there a way to segregate the sending unit from the pump for testing purposes? I mean, its not like its gonna be a whole lot more hassle if I just try it without the sending unit but I like to be prepared before I go buy my parts.

 

Smack the bottom of the tank with a hammer right underneath the fuel pump, if it starts ya got a bad fuel pump. Great easy test!

 

LOL I've used the BFH method on the starter before but never on the fuel pump.

Vise grips, duct tape and a BFH, I can fix anything! lol

 

So I had the same issue. Intermittent stalls over the course of a year. No ryme or reason could be on highway could be at a stop sign. I troubleshooted for months and replaced to many parts n sensors to list. I could never get it to stalls while hooked up to my scanner or mimic the issue while working in it. The 03 f350 5.4 I have has the fuel pump relay built into the cjb or as most of us call it the fuse panel at the drivers knee space. Some 250s n 350s have them under the hood or behind the radio. Not mine and I think 02 and 03 were the only years with this " unserviceable fuel pump relay. Anyways that was the cause of my truck just turning off out of no where problem. Replaced the entire fuse panel 460$. Hope this ain't your issue but it just might be. After a year it happened more regularly and I found instead of firing right up the first try after the stall it would crank a few times then start. Then have to sit for a few minutes. Untill it finally crapped out and would crank with no start at all. No pressure at fuel rail when in no start condition. Relay was overheating and finally failed completely. Hope this helps. Wish some1 told me this. I tracked it down from a guy with a 5.4 expedition with the same exact issue.

 

If it is in fact the fuel pump relay and it is unservicable, why couldn't I just install a relay and jump the unservicable crap? Would be alot cheaper than $460. I'm confused as hell on what to do here. I guess Im gonna start the cheapest and work up. First stop is the cam sensor. After that Im jumping this unservicable relay if that is what I got.