Fuel Pump GM Small Block | Sierra 18-7268 GM Small Block Fuel Pump | Sierra 18-7268 Sierra 18-7268 Fuel Pump AC Mechanical Fuel Pump Fits GM V8 305, 307, 350, and 400 cu. in. engines Dual diaphragm sight glass required Replaces OMC 981650, 3855276 Replaces Volvo Penta 3855276