72 in Extension Harness for 6.5L GM Diesel PMD/FSD Relocation 72" extension harness connects the original PMD/FSD wiring harness to a relocated PMD. The length of this extension permits a wide range of relocation options. This extension harness is compatible with all black PMD/FSD units; it will not work with gray PMDs. 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 to 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 fuel 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 limits, 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. FEATURES Made in USA 72 inch (6 feet) overall length Aircraft grade, high temperature wire Soldered terminals COMPATIBILITY Fits all black PMDs; NOT compatible with gray PMDs 1994 - 2000 Chevrolet/GMC C2500, C3500 - 6.5 liter V8, diesel1994 - 2000 Chevrolet/GMC K2500, K3500 - 6.5 liter V8, diesel1994 - 1998 Chevrolet/GMC C1500 - 6.5 liter V8, diesel1994 - 1999 Chevrolet/GMC K1500 - 6.5 liter V8, diesel1994 - 2000 Chevrolet Suburban C2500 - 6.5 liter V8, diesel1994 - 1999 Chevrolet Suburban K1500, K2500 - 6.5 liter V8, diesel1994 - 1999 Chevrolet Suburban C1500 - 6.5 liter V8, diesel1994 - 2002 Chevrolet/GMC C3500HD chassis cab - 6.5 liter V8, diesel1995 - 1999 Chevrolet Tahoe - 6.5 liter V8, diesel1994 - 1999 GMC Yukon - 6.5 liter V8, diesel1994 - 1997 Chevrolet G20/G30 vans - 6.5 liter V8, diesel1994 - 1995 GMC G2500/G3500 vans - 6.5 liter V8, diesel
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