Electric Fuel Pump E3500M for 1999-2004 Chevrolet Silverado and GMC Sierra 1500/2500/3500 and more 4.3L/ 4.8L/5.3L/6.0L/8.1L-Must Check Compatibility Below Packaged in Airclin color box Meet or exceed OE quality, quiet and smooth in operation Every single pump is 100% tested in all standards before shipping out of the factory Best materials are used for longer life and durability Designed and manufactured by state of art technology for optimum fuel flow