Fuel Pump Delivery Quantity, Checking

Fuel Pump Delivery Quantity, Checking (vehicles With 6-cyl. FSI-engine)

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; check.
- 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 rear 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 -.







- Connect pressure gauge V.A.G 1318 to fuel line using adapter 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 pressure gauge shut-off valve. 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/15 s).

NOTE: Voltage at fuel pump with engine stopped and pump running is approx. 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.

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

Torque specifications

Component Nm
Fuel line to fuel rail 22