PMD Cooling Relocation Kit

Solve Stalling & Extend PMD Life

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 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. For maximum cooling, extension cables let you move it even farther away—like onto the fender or behind the grille.

Replacement PMDs Built to Handle the Heat

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.

Extension Harness to Customize Placement

To mount your PMD Cooler 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.

Calibration Resistors to Fine-Tune Fuel Output

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.

Cheap Knockoffs Don’t Hold Up

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.

The parts available to purchase on this page are from trusted manufacturers with proven reliability!