Question about 1995 Chevrolet K2500

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My 1995 chevy 6.5 L diesel dies at highway speeds. Why?

Begins to run fine again when letting up on the accelerator.

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I could bet 99.9% with out seeing the truck my self that your probelem is the PMD I have two of these trucks and know many people that also have them and the vast majority of problems with the Chevy 6.5L diesels are from the PMD. A must when replacing the PMD is moving it from its place on the injection pump on the top of the engine to a place that dosent get so hot. A good place is the front bumper or skidplace, search for Heath Diesel they have a kit to move it. Its worth every penny.

Justin

Posted on Feb 10, 2009

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I have personally had a lot of problems with the PMD. While driving one day the engine just died, no reason. This continued until I replaced the PMD, fixed the problem.

Posted on Feb 08, 2009

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If it only happens at hwy speeds or on heavy throdle it is most likley the oil pressure switch. OPS controls the lift pump located on the frame rail under the drivers door. the injector pump will pull enough fuel to run at in town speeds but not under heavy loads. The OPS was not built heavy enough to run the pump and burns out. There is a kit you can buy that will run the pump through a relay to keep the OPS from burning out. The OPS is located on the back of the engine drivers side top

Posted on Jul 22, 2012

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