Fuel Pump, Checking Delivery Rate, 4-Cylinder TFSI

Fuel Pump, Checking Delivery Rate, 4-Cylinder TFSI

Special tools, testers and auxiliary items required

• Pressure Gauge (V.A.G 1318)

• Adapter (V.A.G 1318/11)

• Adapter (V.A.G 1318/12)

• Remote Control (V.A.G 1348/3A) with Adapter Cable (V.A.G 1348/3-3)

• Measuring container, fuel-resistant

Test Conditions

• Battery voltage min. 12.5 V.

• Fuel filter OK.

• Fuse On Fuse Panel (S228) (position 28) OK.





• Fuel Pump (FP) Control Module (J538) OK; checking. Refer to => [ Fuel Pump (FP) Control Module, Checking, Vehicles with 4-Cyl. TFSI Engine ].





• Fuel tank at least 1/4 filled.

• Ignition switched off.

Test Sequence

- Remove rear seat bench.

- Remove cover - arrows - for right locking flange.





- Disconnect electrical harness connector - arrow - at right locking flange.





- Connect Remote Control (V.A.G 1348/3 A) with Connection (V.A.G 1348/3-3) to contact - 1 - using an adapter cable from the Connector Test Set (V.A.G 1594C).





- Using insulating tape, tape over the second contact of Connection (V.A.G 1348/3-3) to prevent a short circuit - arrow -.

- Connect contact - 4 - to vehicle Ground (GND) using a jumper cable from the Connector Test Set (V.A.G 1594C ).

- Connect alligator clip to vehicle battery (+).

- Remove fuel filler cap from fuel filler tube.

- Remove engine cover - arrows -.





CAUTION!
Fuel system is under pressure! Before opening system, place clean rags around the connection. Then release pressure by carefully loosening the connection.

- Disconnect fuel line - arrow - from line connection on engine.





- Connect Pressure Gauge (V.A.G 1318) to fuel supply line using Adapters (V.A.G 1318/11 ) and (V.A.G 1318/12).





- Connect assisting hose - arrow - to pressure gauge and hold it in a measuring container.

- Open shut-off valve of pressure gauge. The lever points in the direction of flow.

- Generate pressure in the fuel system by pressing the switch of the remote control and slowly closing the shut-off valve of the pressure gauge.

• Specified value: 4 bar positive pressure.

- From this point on do not move position of shut-off tap.

- Empty the measuring container.

- Press the switch on the remote control for 15 seconds.

- Compare quantity of fuel delivered with minimum delivery rate in diagram (cm3/15s).





• Voltage at fuel pump with engine stopped and pump running is approximately 2 volts less than battery voltage.

Assembly is in reverse order of removal, note the following:

- Install the fuel line.

Tightening Specifications