engine just shuts off?

[Engine65]

i will be driving and the truck just shuts off. i recently replaced the pmd and has a #9 resitor. i pull off the road pop the hood and disconnect the batteries and wait the hook back up and then it will start;or i can disconnect the plug on the pmd and go back with it still disconnected and crank the engine once then go back under the hood and conect the pmd back up and then it starts. it used to before i replaced the pmd stall and start back up, then it got to the point it wouldnt start. i called ss diesel and replaced the pmd with a new resistor had no problems till now. any thoughts on what could be wrong??

[JD_countryboy]

Whers the pmd located? if its till in the engine compartment it could be cooked again? Maybe a fuel shutoff solenoid going bad? once it gets hot, it shuts off, and stops fuel to engine. After it cools a bit it reopens and works for a bit. Make sure all your wires and such are tight and clean. How many miles? maybe pump is going bad?

[Engine65]

268000k miles fuel shut off was replaced a while back by dealer. this is the second fsd/pmd that i have put in. it is mounted with the heatsink on top of the intake got it from ss diesel.

[Chevylover]

You should the big wire connector at the firewall on the passenger side. Sometimes there are some wires loosen or corroded. Somebody here got the the same problem and searched and replaced a lot of parts until he found a loosen connector at this point.

Cu,
Sven

[MAGNUM SERVICES]

Any computer codes ? When mine shut down it did not show any codes and my friend who was a GM dealer mechanic told me it was the pump . Replaced it and everything has been fine .

[torque454]

I wonder how good of a ground the pmd gets bolted to a piece of aluminum and then bolted to an aluminum intake. How good does aluminum conduct electricity? Ive never really tested that. Also, how about the contacts in the plug and the pmd. If theyve ever gotten any exposure to moisture couldnt they corrode a little and make a bad contact? Ive had that happen on my old fords with the duraspark II external ignition module. Sometimes the engine would stall and not restart, but if i would go under the hood unplug the connectors and then plug them back in, it would start and be fine again for a while. The module tested good, i even tried 3 or 4 new modules all with the same result. The problem turned out to be a bad connection in the plugs. They used some sort of grease inside the plugs and it was all old and nasty, and when i had put on a new module several years earlier, i didnt put anymore grease in it. I finally took it apart and cleaned all the grease up as best i could, on both connectors, put in some new grease and put it back together and its been fine every since. I drove it 2000 miles to and from vacation after that and its been fine. I could easily see the pmd having a similar issue. I dont think those connectors are greased, but they could be i guess. Ive never looked. Or the terminals could just have some corrosion on them and cleaning it up somehow might cure it. It did mine. Maybe using some of that grease in it could help, even if it didnt come with it factory. I dont see what it could hurt. Somone else chime in on this if its a bad idea. Just some thoughts.

[vmac4]

The grease you refer to is dielectric grease(a silicone paste).It is a
water blocker and is there to help prevent corrosion.look for varnished
terminals(or burnt) and clean them with electrical terminal cleaner.
make sure the connections are tight,may have to tighten the pin connections
with a pick,or replace the terminal pins.Loose connections can cause a lot
of exspensive repairs.It may sound like a simple repair,but finding it is where
it could be difficult.Good luck

[Sundance]

Aluminum is an excellent conductor, one of the best. The trouble comes in mixing in different metals in connectors and leads. Galvanic corrosion sets in and makes aluminum a problem if not careful. Dielectric grease helps.