Suction Jet Pump, Removing And Installing
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 baffle housing of the fuel delivery unit -1-, a suction jet pump -2- is utilized.
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
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 of the tank) remains in the left chamber of 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:
-- Check the fuel pump. Refer to Vehicle Diagnostic Tester.
-- 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 with approximately five liters of fuel.
-- Start the engine.
If the engine now starts:
-- The suction jet pump is not available separately; replace the fuel tank. Refer to FUEL TANK, REMOVING AND INSTALLING, AWD VEHICLES .