On the early GM diesel trucks either a mechanical or an electric feed pump was used to supply a low pressure of fuel, typically around 5 PSI, to the mechanical injection pump. The part numbers vary according to the chassis style.
Applications:
1992-1993 GM 6.5L C/K Series Trucks
1988-1993 GM 6.2L C/K Series Trucks
1988-1989 GM 6.2L R/V Seires Trucks - Frame Mounted
1988 GM 6.2L G Series Vans - Frame Mounted