GMG is now fully remanufacturing Ambac M50 pumps to OEM specs and fully testing them. Pumps come ready for 2 and 4 cylinder installations. We are providing a $50 core credit for any rebuildable core. You can purchase a remanufactured MEP002A-MEP003A Ambac M50 Fuel Injection Pump 50-2/4A-80A-9540A here.