Suction Jet Pump, Removing And Installing

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For 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 to the baffle housing -1- of the fuel delivery unit -2-, a suction jet pump -3- is utilized.

Courtesy of AUDI

Suction Jet Pump Function

The 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 due to Faulty Suction Jet Pump

CAUTION:

Vehicle breakdown due to faulty suction jet pump.

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

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

If the vehicle stops running due to lack of fuel even if the fuel tank is approximately ¹ /₄ filled, proceed as follows:

-- Fill with approximately five liters of fuel.

-- Start the engine.

If the engine now starts:

-- Replace the fuel tank. Refer to FUEL TANK, REMOVING AND INSTALLING . The fuel tank is not available separately.

If the engine does not start:

-- Check the fuel pump electronically using the Vehicle Diagnostic Tester.