GMPartsGiant.com offers the wholesale prices for genuine 1994 GMC Suburban C2500 parts. Parts like Vacuum Pump Mounting are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L. Model Code: 3/4 TON.