Fuel Supply System

Fuel Pump Delivery Rate, Checking

Special tools, testers and auxiliary items required

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

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

• Connector Test Set (V.A.G 1594C)

• Measuring container, fuel-resistant

Procedure

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

- Remove the fuel cap from the fuel filler tube.

TT Coupe:

- Remove rear seat bench.

TT Roadster:

- Remove the right side rear panel trim panel.

All Vehicles:

- Unclip catches - arrows - of right connector flange cover.






- Disconnect the connector - arrow - from the locking flange.






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






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

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

- Connect alligator clip to battery positive.

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

• To reduce pressure in the fuel system, lay a clean cloth around the connector and carefully loosen connector.

- Press the release button and disconnect the fuel return line - arrow -.






- Connect (V.A.G 1318/17-1) to disconnected fuel return line and hold it in a 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.

Assemble in reverse order of disassembling. Note the following:

TT Coupe:

- Install rear seat bench.

TT Roadster:

- Install the right side rear panel trim panel.