Fuel Pump (FP) Delivery Quantity, Checking

Fuel Pump Delivery Quantity, Checking

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
- Fuel-resistant measuring container

Test conditions
- Battery voltage at least 12.5 V.
- Fuel filter OK
- Fuse on fuse panel S228 (position 28) OK.







- Fuel Pump (FP) Control Module J538 OK.
- Fuel tank at least 1 / 4 filled.
- Ignition switched off.







Test sequence
- Remove rear seat bench.
- Unbolt cover for left locking flange - arrows - .







- 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 connector test set V.A.G 1594 C .
- 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 connector test set V.A.G 1594 C .
- Connect alligator clip to vehicle battery (+).







- Remove fuel filler cap from fuel filler tube.
- Remove engine cover - arrows - .

CAUTION: The fuel system is under pressure! Before opening system, place rags around the connection area. 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 extension hose - arrow - to pressure gauge and hold it in a measuring container.
- Open shut-off valve of pressure gauge. The lever points in direction of flow.
- Generate pressure in fuel system by pressing switch of remote control and slowly closing shut-off valve of pressure gauge.
- Specification: 4 bar positive pressure.
- From this point on do not move position of shut-off valve.
- Empty measuring container.
- Press switch on remote control for 15 seconds.







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

NOTE: Voltage at fuel pump with engine stopped and pump running is approx. 2 volts less than battery voltage.

Installation is in reverse order of removal. Note the following:
- Install the fuel line.

Torque specifications

Fuel line to fuel rail 22 Nm