Improve Injection Pump Reliability with this Simple ModOne of the most common failures with the DS4 pump on 1994 - 2000 Chevy 6.5 liter diesel engine applications is the Pump Mounted Driver (PMD), located on the side of the pump. BDs PMD Pump Mounted Driver - located on the side of the 6.5L Chevy Stanadyne DS4 injection pumpRelocation Kit moves the PMD Pump Mounted Driver - located on the side of the 6.5L Chevy Stanadyne DS4 injection pumpaway from this area of potential heat build - up and mounts in on an extruded aluminum base to provide better heat sinking. Easy installation, plus improved access for future diagnostics andor repair.