Electric Fuel Pump, Module Assembly for Chevrolet Chevy Silverado GMC Sierra 1999 2000 2001 2002 2003 4.3L/4.8L/5.3L OEM E3501M COMPATIBILTY - ECCPP Electric Fuel Pump for 2001-2003 GMC SIERRA 3500 V8 8.1L;1999-2003 CHEVROLET SILVERADO 1500 V6 4.3L 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 Always keep enough fuel in the tank for the pump to be submerged in gas. Keep the habit of fueling to your car in time. Choose high quality car gasoline. Fuel   comes through filter to the Tubine Impeller. So if the fuel contains   too much impurities, it can block the filter and damage the Tubine   Impeller. So please replace the Filter on a regular basis and always use   high quality gasoline.