Suction Jet Pump, Removing And Installing

WARNING: This page is about a different variant/trim than selected.

For All Wheel Drive (AWD) vehicles, the fuel tank is divided into a left and right chamber. To move the volume of fuel from the left fuel tank chamber to the right baffle housing of the fuel delivery unit -1-, a suction jet pump -2- is utilized.

Courtesy of AUDI OF AMERICA, LLC

Suction Jet Pump Function

Function of the suction jet pump is based on a simple physical principle: a suction jet from the electrical fuel pump is compressed by a nozzle in the suction jet pump and is thereby accelerated. This acceleration causes the surrounding fuel to be drawn in and be forced to the baffle housing of the fuel delivery unit.

Malfunctions of Faulty Suction Jet Pump

CAUTION:

Tow-in due to faulty suction jet pump.

If suction jet pump is defective, the vehicle can stop running due to lack of fuel, though the fuel tank is up to ¹ /₄ filled.

If the suction jet pump does not function, up to 15 liters (15.85 quarts) of fuel (up to approximately ¹ /₄ of the tank) remains in left chamber of fuel tank which cannot be extracted by the fuel delivery unit.

If vehicle stops running, although the fuel tank is approximately ¹ /₄ filled, proceed as follows:

-- Fuel pump, checking. Refer to Vehicle Diagnostic Tester Guided Fault Finding .

-- Follow the instructions in the vehicle diagnostic tester display.

-- After reading out the control module name, GO TO -button and select the function/component.

-- Select function or component:

+ Drive
	+... - Engine
		+ 20 Fuel Supply
			+ Electrical Components
				G6 - Fuel Pump

-- Continue to follow the instructions in the vehicle diagnostic tester display.

If the fuel pump is OK, but no fuel is being delivered:

-- Fill approximately 5 liters (5.28 quarts) of fuel.

-- Start the engine.

If the engine now starts:

-- The suction jet pump cannot be delivered separately; replace the fuel tank. Refer to FUEL TANK, REMOVING AND INSTALLING, ALL WHEEL DRIVE VEHICLES .