It started as an occasional problem but now it's all the time. I have efuel running off the old fuel heater wire so it eventually shuts down from lack of fuel but not by the key.

I've replaced or checked

Glow plug solenoid (replaced)
Key switch (the one in the column under the dash)
All wires going to glow plug solenoid

Any help would be greatly appreciated I'm getting tired of popping my hood and pulling the PCM relay. Thanks

 

I take it you have already switched in the PSD? It might have something to do some wiring you had to do for the swap. Fuel injection occurs only because the PCM send the signal to do so. That means for whatever reason the computer thinks the key is still on.

That leaves 2 possibilties at the top of my mind:
1) The key switch is bad.
2) A wiring problem, maybe a short between a hot wire and the wire from the key to the pcm.

It sounds like you need to look at the wiring diagram and get your multimeter out to trace the problem. Good luck, I hate problems like this.

 

Could also be a problem in the steering column. There's a plastic toothed track in the column that can break which allows you to turn the truck on and start it, but it won't pull the switch (the thing at the base of the column) forward when you rotate the key to shut the truck off.

 

I pulled that key switch out already and operated it manually and the problem was still there. The key switch is only 2 months old so I don't think it would fail that quick. I read it could be a bad PCM? Is there a way to check for that?

 

this may be of some help, i dont know if they are the same in a relative way of speaking or not with the difference in years. good luck.

https://www.ford-trucks.com/forums/1...ht=testing+pcm

 

If it were the key switch stuck on, then the e-fuel pump would still be running.

The usual culprit is the GP relay. The always-on big terminal shorts over to the red/green wire small terminal. This provides sneak-back power to the PCM even after the key switch has turned off fuse 22. But in your case, if this happened the e-fuel pump would still be running because it's powered by that same wire.

Hmm, I wonder if it would shed any light to try this experiment - start it up, then go under the hood and pull fuse #22. See if it shuts down right away, or only after the fuel pump starves it.

 

Ok I'll give it a try tonight or tomarrow and report back the findings I'm at a wedding all day today

 

Ok pulled fuse 22 and nothing happened the truck continued to run so I pulled fuse number 9 and the truck shut down but I did notice as the truck was shutting down the PCM relay was clicking extremely fast is that nomal?

 

No it's not normal. Fuse 22 is the PCM relay coil fuse and fuse 9 is the PCM relay contact fuse. So by pulling fuse 22 and and the truck keeps running (the relay is still pulled in) means it is getting power someplace after fuse 22. The only place I can see this happening is a feedback from the GPR. Try disconnecting both small wires on the GPR and redo the test.

 

Ok so I disconnected the wires and tried again and the truck shut off when I pulled fuse 22 so if I'm following this correctly my new gpr is bad?

 

With the GPR wire disconnected, does it shut off with the key?

What brand/number of GPR? Most of the ones from the FLAPS are junk.

 

What is FLAPS?

 

That I didn't check . Un sure of the brand it's been sitting on my shelf for a month or 2

 

Does it look like this, OEM Ford or something else ...

 

Sorry - FLAPS is Friendly Local Auto Parts Store