The PMD (Pump Mounted Driver), also referred to in some instances as the FSD (Fuel System Driver), is the Achilles heel of the 6.5L GM diesel. As such, relocation of the PMD is quite common and relocating options are plentiful. This 72" harness permits PMD relocation into a variety of locations.
The PMD/FSD is mounted to the driver side of the Stanadyne DS4 injection pump on turbocharged 6.5L GM diesels. A tremendous amount of heat is generated as it intensifies the signal from the powertrain control module to the fuel solenoid. During normal operation the flow of diesel is used as a coolant and, in theory prevents the module from overheating. However, underhood temperatures and the heat generated by the engine itself often prevent proper cooling and cause the PMD to fail prematurely. Additionally, a "heat soak" effect occurs when a hot engine is shutdown and the temperature of the PMD can increase considerably beyond its design temperature, further contributing to a shortened service life and intermittent operation.
As a result of the inherent problems with the PMD/FSD location, it is common for 6.5L GM diesel owners to move the PMD to a more ideal location where a cooling effect is encouraged and the heat soak effect is either reduced of eliminated. Common relocation placements include the front bumper, near the battery box, against the firewall, or similarly isolated locations. We highly suggest researching various relocation options and their inherent advantages/disadvantages before making a final decision.
• All turbocharged 6.5L GM diesels
• Fits black PMD/FSD only - separate connectors are required for gray units
• Applying dielectric grease to the connector terminals is highly recommended
• A calibration resistor (not included) is required when replacing the PMD; this is typically purchased with the new PMD/FSD and is not included with this harness extension
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