The Fuel System:
Supply Pumps
Fuel injection pumps must be supplied with fuel oil under pressure, because they have insufficient suction ability. Therefore, all injection systems require supply pumps to transfer fuel from the supply tank to the injection pump.
Pumps for this purpose have a positive suction lift, and their performance is independent of any normal variations in viscosity, pressure, or temperature of the fuel. The pumps in use today are gear, plunger, and/or vane types. |