Fuel Pump: Testing and Inspection

WM 206601 Checking quantity delivered by fuel pump

Tools









Information

Preliminary work

Information

Before checking the fuel quantity, a pressure check must first be performed in accordance with Guided Fault Finding in the PIWIS Tester or based on the instructions in the repair information. -> 200201 Checking fuel pressure 20020100 Checking fuel pressure

Tools and materials

Test tool setup





Tool setup for pressure test









Tool setup for delivery rate check





Checking quantity delivered by fuel pump

WARNING

Toxic substances

- Danger of poisoning or suffocation

-> Ventilate the work area well.
-> Never ingest or inhale.
-> Read specific information on the Hazard Sheet.
-> Wear personal protective gear.

WARNING

Highly inflammable or explosive materials

- Danger of fire or explosion

-> Avoid contact with hot parts or sources of ignition.
-> Use suction to remove ignitable vapours.
-> Attach warning sign in a clearly visible position.

1. Place a cloth under the fuel supply line (low-pressure) -line 4- and open the line using two open-ended wrenches. Counter at the centre piece while doing this and loosen the union nut at the engine side. => Fuel low-pressure line





Junction point for lines in engine compartment





Fuel low-pressure line

2. Connect the tester to the body-side low-pressure hose. The set-up must be fully sealed. => Measuring tool set-up





Measuring tool set-up

3. Hold the free end of the hose downstream of the pressure reducer into a large measuring container (recommended volume of 5 litres). => Delivery rate test in measuring tub or bucket





Delivery rate test in measuring tub or bucket

4. Connect the Tester and get it ready. PIWIS Tester II 9818
4.1. Connect a charger to the vehicle battery. The voltage should be approx. 12.5 V (no rapid charging allowed because the voltage is too high!).
4.2. The fuel pump can be activated and deactivated as follows:
4.3. Diagnostics => Panamera => DME => Drive link test/checks => Drive links => Fuel pump 1
4.4. 100% is displayed. The fuel pump starts to deliver fuel when you press Start.
4.5. The fuel pump stops when the percentage value changes to 0%. Press Start again.
5. Have a stopwatch ready.
6. Activate the fuel pump. The fuel pump must deliver at least 3 litres a minute.