Fuel Pump Delivery Rate, Checking, FSI and TFSI Engines

Fuel Pump Delivery Rate, Checking, FSI and TFSI Engines

Special tools, testers and auxiliary items required

• Fuel Inj. Pressure Gauge-CIS (V.A.G 1318)

• Adapter (V.A.G 1318/11)

• Adapter (V.A.G 1318/17-1) from Adapter (V.A.G 1318/17)

• Fuel Line Feed Adapter (V.A.G 1318/23)

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

• Connector Test Set (V.A.G 1594A)

• Measuring container, fuel-resistant

Procedure

Observe test conditions, refer to => [ Test Conditions ] General Information.

- Remove rear seat bench.

- Unclip the retainers - arrows - of the cover for sealing flange.





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





- Connect (V.A.G 1348/3A) with (V.A.G 1348/3-3) with an adapter cable from (V.A.G 1594A) at terminal - 1 -.





- Cover the second connector terminal of (V.A.G 1348/3-3) with insulating tape - arrow - to prevent short circuit.

- Connect contact - 5 - to vehicle ground (GND) using a jumper cable from the (V.A.G 1594C).

- Connect alligator clip to battery positive.

- Remove fuel filler cap from fuel filler tube.


There is a risk of injury because the fuel is under high pressure.

• Before opening the fuel system, lay a clean cloth around the connection point and carefully loosen it, which lowers the pressure.

- Pull the release button to disconnect the fuel supply line - 3 -.





• If equipped, the fuel return line - 2 - and the vacuum line - 1 - remain connected.

- Attach (V.A.G 1318/23) and (V.A.G 1318/17-1) to (V.A.G 1318).





- Install the (V.A.G 1318/17-1) on the disconnected fuel supply line.

- Attach (V.A.G 1318/11) to (V.A.G 1318). Push an assisting hose - arrow - onto it and hold it into 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 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.

If minimum delivery quantity is not obtained, the following malfunctions may be present:

• Fuel lines pinched.

• Fuel filter clogged.

• Fuel pump faulty.

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

- Install rear seat bench.