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A PMD Cooler relocates the PMD away from the engine heat and drops temperatures by 30–80°F, depending on conditions. Lower temps = longer life and fewer breakdowns. Installation is simple, using the existing wiring harness, and mounting it to the intake works well for most situations.
A FULL KIT WOULD INCLUDE:
Select the components you need for your installation from the menu below. If you need any additional information about the components we recommend, feel free to check out the component descriptions and view the individual product pages for more info.
The PMD (Pump Mounted Driver), also called the FSD (Fuel Solenoid Driver), has long been a weak spot in the 1994+ GM 6.5L diesel engine. It sits on the injection pump, buried in the hot engine valley, and relies on fuel flow for cooling—a system that often can’t keep up. When it overheats, the PMD’s internal circuit board can crack, causing the engine to stall while driving or fail to restart when hot (known as a "hot soak" issue). A PMD Cooler is the solution.
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The original PMDs were never built to last in the harsh heat and vibration environment of a diesel engine bay. Fortunately, Flight Systems Electronics Group tackled the problem with the original PMD and manufactured an outstanding Pump Mounted Driver that handles the high temperature environment and holds up great. Their DTech unit is a direct bolt in replacement for the original, an has a One Year 50,000 mile warranty.
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To mount your PMD Cooler further away from engine heat, you may need an extension harness. We offer 8", 40", and 72" lengths to help you install your PMD where it runs coolest. Available in both black and gray connector styles to match your PMD. Short extensions are great for intake manifold installs or harness routing issues, while longer ones let you reach the fender or radiator area for maximum cooling.
Black 8" »
Black 40" »
Black 72" »
Gray 8" »
Gray 40" »
Gray 72" »
Each PMD uses a resistor to help set the fuel delivery level from the injection pump. These are numbered from 1 to 9; if no resistor is installed, it defaults to #5. Installing a #9 resistor gives the highest fuel delivery—ideal for a small performance boost.
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There are PMDs being made and sold from China which are being sold with all kinds of ridiculous warranty claims and low prices. The feedback we are getting is that these copies are not reliable. Don’t be fooled! There is no such thing as a lifetime PMD.
Local: 414-421-7222 | National: 800-776-7102