Hey all,
I've been having an intermittent stall-out problem with my 2003 F250 5.4L (160k miles). The truck has been retired from DD to farm duty, hauling, and towing only. Over the past 9 months, the truck has stalled-out on me 3x while driving. I will be driving along sometimes at highway speed, sometime slower, and everything will die: no PS, lights go on all over the dashboard. It will not restart right away. I have to wait at least 20-30min to restart it and then everything is fine for several weeks and hundreds of miles.

There are no codes and I have been unable for reproduce it/cause it to happen purposely. My mechanic has changed the Crankshaft Position Sensor, and checked the fuel rail pressures. I also checked all the harnesses and fuses, cleaned the battery terminals, looked for vacuum leaks, and gave it a good look-over. The following are new: battery, IAC valve, fuel filter. After searching the forum I also pulled the fuse box and examined the integral fuel pump relay: it and the board looked perfect, no bulges, cracks, discoloration, etc.

My mechanic thinks this is more likely an ignition problem than a fuel delivery problem.

Does anyone have any suggestions? Has anyone had the same problem?

Thanks!

 

My bet is on the fuel pump...

 

I would also ask this question in the 5.4 forum. But I would agree with fuel pump.

 

I have suspected the fuel pump, but unfortunately we have not seen any other signs pointing to it. The mechanic seems to think that if it were the pump, it would have quit and not restarted the last time she stalled-out.

I have since started driving around with 5' of garden hose in the bed so if she stalls-out again, I can stick one end in the fuel filler and the other in my ear to try and listen for the pump.

Are there other ignition-related things I should be looking at?

 

Change the fuel filter. Then cut it open to see if it's kind of plugged up. If so problem solved on the cheap