Fuel Pump: Description and Operation

Suction Jet Pump - All Wheel Drive (AWD)

Function







The fuel tank on vehicles with All Wheel Drive (AWD) employs a multi-chamber (2 chambers) system.

In order to transport the fuel volume from the left chamber to the accumulator -6- of the fuel delivery module in the right chamber, the system uses a so called suction jet pump -8-.

A second suction jet pump -2- is located in the right fuel tank chamber and increases the fuel delivery to the accumulator of the fuel delivery module.

The suction jet pumps operates after the "Fluid entrainment principle": The jet of fuel from the fuel return line -4- is forced via jets in the suction jet pumps -2- and -8-, and is therefore accelerated. This acceleration sucks the surrounding fuel to the accumulator of the fuel delivery module. The right suction jet pump -2- pumps the fuel directly into the accumulator, the left suction jet pump -8- over a separate line -7-.

The fuel is via the distributor connector-1- distributed to both suction jet pumps. At the same time the distributor regulates the pressure in the lines to the suction jet pumps at approx.: 1 bar (14.7 psi). Excessive fuel is sent via a direct line -5- to the accumulator.

3 - Fuel supply line