Electric Fuel Pump, Module Assembly fit for Pickup Chevrolet Chevy Silverado GMC Sierra C3 1500 2500 3500 2001 2002 2003 4.3L 4.8L 5.3L 6.0L 8.1L OEM E3500M COMPATIBILTY - ECCPP Electric Fuel Pump for 1999-2004 Chevrolet Silverado 1500 for V6 4.3L;1999-2003 GMC Sierra 1500 for V8 5.3L FUNCTIONS - Suck the fuel from the fuel tank, pressurize it and then deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure. Guaranteed supply of continuous fuel to the injector DISCLAIMER - ECCPP Fuel Pump Assembly DOES NOT come with pressure sensor, the original black pressure sensor on the top of the assembly must be reused at time of installation BENIFITS - ECCPP Fuel Pumps are low noise pump, better driving comfort, balancing cost and reliability to meet different needs IMPORTANT NOTE - Please make sure to match the exact part numbers between this part and the part that you are replacing. Contact your mechanics, or send us a message to make sure it matches exactly in case of doubt before purchasing Fuel Pump may leak internally Excessive noise Engine will crank,but fail to start Lack of Power Hesitation when accelerating 1. Keep the habit of refueling the car in time, don&#039;t wait until the oil lamp is bright to add 2. Choose high quality car gasoline 3. Timely cleaning or replacement of gasoline filter