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Harness to pdm
- Thread starter Boblaw66
- Start date
MrMarty51
Well-Known Member
Best to remove the intake manifold.
Also have an extension harness in hand.
Leroy Diesel and Quad Star Tuning sells the highest quality units.
Their kits comes with the Flight Systems, made in USA pump driver thats guaranteed for life.
Order a spare though unless the truck can set for a week or so while a replacement gets to You.
I also splice an extension into the ground wire that goes from the IP ground screw to the harness connector. A foot or so longer then it can be worked out through the right side under the intake manifold.
Makes it a lot easier if You ever need to unplug that extension harness that puts the pump driver behind the front bumper.
I have three on extension harnesses behind the front bumper.
If one fails, open the hood and unplug the bad unit, plug in the good one and go again.
I also numbered the harness connectors so if one goes bad I know which one it is when I get Under the truck to remove the bad unit.
Just having one spare located behind the bumper can save a lot of time and frustration if one does fail.
I don't think I have the original resister in pdm, is that okay or should I order a #5. Also, while I was changing my fuel filter in was checking pdm harness that goes to engine compartment, and when pushed on it, the engine shut off. So I started it, pushed again, lightly, engine started to shut off, I let go and stayed running.. any thoughts? Thanx so much.
MrMarty51
Well-Known Member
Figure which wire is causing the shut down, might be a loose or bent pin. Could be a broke wire too.
Most people run the #5 resistor.
I read that without a resistor eventually the engine will shut down and not restart.
Dont remember what the solution to that is.
Most people run the #5 resistor.
I read that without a resistor eventually the engine will shut down and not restart.
Dont remember what the solution to that is.
Will L.
Well-Known Member
Sounds like one of the wires doesn’t have the little tab in place that holds the pin securely in the connector.
MrMarty51
Well-Known Member
While the harness is disconnected,
Do a close up examination on both sides for bent pins, then, if no pins is bent or missligned, pull/push on the wires and find out which one is loose.
Get that figured out and I think Your days of the stalling truck will be behind You.
You might even get on the Leroy Diesel or Quad Star Tuning page and get a new extension harness coming if You cant get Your harness figured out.
But yeah, get that resistor in the PMD.
MrMarty51
Well-Known Member
Bad PMD but also could be because of the missing resistor.
I put 3 new pdms in. Yeah, as soon as it gets, i guess, running temp. Shuts right off. I opened the bleeder on the top of the fuel filter turned the key an no fuel, cranked it and no fuel. 30 mins later, fired right up. Takes about 5 secs. To start when cold. Not bad. Then right up after warmed up, idle forever, but when driving, it's done.
ak diesel driver
6.5 driver
Need to hook up a DMM to the pump and verify it's losing power. Could be a faulty oil pressure sensor
jrsavoie
Recruit
Jumper the lift pump. Or just install a toggle switch to run the lift pump on demand. Cracking the bleeder and then getting in the cab just sounds like an air problem waiting to happen. Not to mention a mess.
1995 and older need the lift pump relay upgrade.
It's PMD or FSD. Not pdm.