Engines | Mounts, , (USED) 1996 Mack EM7-300 Diesel Engine (MECHANICAL FUEL PUMP), Serial # 6C1332, 300HP @ 1750, llGBA 27484P1, LOW MILES! Test Run 6-3-16. Visit jjrebuilders.com for more information on this and any other Diesel Engine you may be looking for. Call 1-800-971-3019. ref INV # 002926