Fuel Pump: Description

NOTE: Some vehicles were retrofitted with electrical fuel pumps to solve a driveability problem. For procedure see TSB # 18-04-86 dated February 10, 1986.

Two types of fuel pumps are currently used. Most gasoline vehicles use an engine-mounted mechanical pump. Vehicles with fuel injection use an electric pump. Chrysler Imperial models use a low pressure (8-14 psi) pump.

Vehicle manufacturers recommend that the pump be replaced as an assembly if found defective. Check pumps for fuel pressure, volume and vacuum (suction). DO NOT attempt to overhaul or repair pump assembly. Some pumps will have an extra connection for fuel and vapor return to aid in hot starting and prevention of vapor lock.