Suction Jet Pump, Checking

WARNING: This page is about a different car, the 2015 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

On vehicles with AWD the fuel tank is divided into a left and a right chamber. To move the volume of fuel from the left fuel tank chamber -3- to the right baffle housing of the fuel delivery unit -2-, a suction jet pump -1- is utilized.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Function of Suction Jet Pump

The suction jet pump functions according to a simple physics principle: A suction jet from the electric fuel pump is pushed through 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 Defective 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 suction jet pump does not function, up to 15 liters (15.8 qts) of fuel (up to approximately ¹ /₄ tank) remain in left chamber of fuel tank.

This fuel cannot be extracted from the fuel.

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

-- Check the Transfer Fuel Pump -G6-. Refer to Transfer Fuel Pump -G6-, CHECKING .

If The Fuel Pump Is OK, But No Fuel Is Supplied:

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

-- Start the engine.

If The Engine Now Starts:

-- Replace the suction jet pump. Refer to SUCTION JET PUMP, REMOVING AND INSTALLING .