Won't Stay Running!! - Chevy and GMC Duramax Diesel Forum
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post #1 of 2 (permalink) Old 08-14-2010, 05:54 AM Thread Starter
Join Date: Oct 2009
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Won't Stay Running!!

Hello everyone, I posted on the "starts but stalls" thread but figured i would post a new one. I have a 96 GMC 1 ton, automatic. It starts hard and then will run for about 2 minutes and then just die, not choke out or anything just flat die. About 5 hours later you can go do the process all over again. Is this my injection pump? Is there a way I can check the pump. Or is it something else, any help is appreciated. Thanks
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post #2 of 2 (permalink) Old 08-15-2010, 01:30 PM
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Posts: 147
the problem sounds like the pmd,its an electronic part mounted on the side of the injection pump.It can be replaced seperatly with the use of an aftermarket extesnsio wire and heatsink kit found at Heath Diesel,SS diesel,Kenedy Diesel or ebay.
the Heath diesel kit comes with a 7 year no questions asked warranty but it costs some dough,but the warranty more than makes up for it.

To test take a jug of cold water with you on your next startup,then firnd the pmd on the drivers side of the main injection pump,start the truck and let it stall then as soon as you can pour the cold water over the pmd and try to restart.If it starts right back up then thats the most likely problem.
the SS Diesel kit is intended to be mounted on the intake manifold and use the original harness as well as moving the ground for the pump to the heatsink- both of these things are a very bad idea.

the extension cord will allow you to move the pmd and cooler to the front bumper area(where it stays cool-heat is its enemy)anywhere under the hood is too hot for remote mounting because of heatsoake after shutdown and with hot air from the rad and exhaust.Also leave the ground wire attached to the injection pump but do yourself a favor and clean it.
Ps you can leave the old pmd where it is without harm because they are hard to change without removing the lower intake manifold.
The electrical connection on the pmd is on the drivers side and has a clasp that needs to be gently pryed away and the connector pushed towards the rear of the vehicle(its very cramped in there so care should be taken) then with a coat hanger or lenght of wire or dental pick type tool fish out the end of the harness to connect the extension cord.

when replacing a pmd a resistor needs to be installed in the pmd harness connection and is not normally supplied so check with your vendor,the resistors are available from most vendors,stanadyne dealers and ebay.
at this time the stanadyne pmds seem the most reliable but they have an updated design so its best to get a kit to get the right harness

other possable reasons for your shutdown problem could be the fuel shotdown solenoid or a faulty ignition switch, crank sensor or optical sensor.

Last edited by racer55; 08-15-2010 at 01:39 PM.
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