Fuel Pump (FP) Delivery Quantity, Checking

Fuel Pump Delivery Quantity, Checking

Special tools, testers and auxiliary items required
- Hand held remote control (jumper).
- Multimeter.
- Electrical connector test lead set.
- Pressure gauge (High pressure)
- Measuring container (fuel resistant).

Test conditions
- Battery voltage at least 12.5 V.
- The fuel filter OK
- Fuse S228 OK.
- Fuel Pump (FP) Control Module J538 OK.
- Fuel tank at least 1 / 4 filled.
- The ignition switched off.

Test sequence
- Remove the rear seat bench.







- Remove the right locking flange cover and bolts - arrows - .







- Disconnect the electrical harness connector - arrow - at the right locking flange.
- Connect a Hand held remote control (jumper) to terminal - 1 - of the fuel delivery unit and to vehicle battery (+).







- Connect a jumper cable from a Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
- Remove the fuel filler cap.







- Remove the 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 the fuel line - arrow - .
- Connect a Pressure gauge (High pressure) to the fuel line.
- Connect the extension hose - arrow - to the pressure gauge and hold it in a measuring container.
- Open the pressure gauge shut-off valve. The lever points in the direction of flow.
- Create fuel system pressure by pressing the switch on the Hand held remote control (jumper) in and slowly closing the shut-off valve of the pressure gauge.







- Pump the fuel into the
- Specification: 4 bar positive pressure.
- Do not move the position of the shut-off valve.
- Empty the measuring container.







- Press the switch on the Hand held remote control (jumper) in for 15 seconds.
- Compare the quantity of fuel delivered with the minimum delivery rate in the diagram (cu.cm/15s).

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

If the minimum delivery quantity is not obtained, the following malfunctions may be present:
- Fuel lines pinched.
- Fuel filter clogged.
- Fuel pump faulty.

Installation







- Connect the fuel line - arrow - .







- Install the rear engine cover - arrows - .







- Connect the electrical harness connector - arrow - at the right locking flange.







- Install the right locking flange cover and bolts - arrows - .
- install the rear seat bench.

Torque specifications
Fuel line to fuel rail 22 Nm