have a buddy that has a 97 gmc 6.5 in a suburban he will be hooking up his boat and it will just shut off like somone turned the ingition switch off it dont spit sputter or anything,then he will be going down the road pulling the boat and it will start spitin and sputtering but wont completely shut off it just act like it wants to, any ideas

oh yea and he's changed the fuel filter and he changed the inj.pump with in the last 25,000.

PMD ? Grounds ? FSO ?

Best is to fill out the check list. Without the most will be guessing.



Cu,
Sven

could be the pump driver when they replaced the pump did they replace the driver or just transfer it to the new inj pump or look at the lift pump on the d/s frame rail

First of check and clean all the grounds thoroughly, if that doesn't help see if you can find another PMD to use.
Is the PMD relocated? When the pump was replaced/PMD moved, was the ground put back on the pump cover?

not very knowledgable on the 6.5 so what is the pmd is that the inj. pump driver if so he said he has replaced it also.any other ideas???

yall also said it could be a lose ground. where should i start looking for lose grounds on the inj pump or what.

The PMD is the pump driver....where is it mounted?

Check all of the battery connections, body grounds and block grounds, these things are very touchy about grounds.

If you look in the FAQ's sticky there is alot of info and pictures. With the engine running open the tee handeled valve next to the thermostat. If it kills the engine it has a lift pump issue. The grounds on the rear passenger side of the intake monifold are for the ecm ,transmission, and engine sensors.

ok ill will look at the grounds and try the valve trick and let you know.

i think he has relocated the pmd but i didnt ask where he did.