Checking Fuel Pump Delivery Rate

→ Ventilate the work area well.

→ Never ingest or inhale.

→ Read specific information on the Hazard Sheet.

→ Do not smoke, eat or drink in the work area.

→ 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) → Junction point for lines in engine compartment (3.6 l V6 naturally aspirated engine)  and open the line using two open-ended wrenches. Counter at the center piece while doing this and loosen the union nut at the engine side. → Fuel low-pressure line 
   Fig 1: Locating Junction Point For Lines In Engine Compartment (3.0 L V6 Turbo Engine)

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   Fig 2: Locating Junction Point For Lines In Engine Compartment (3.6 L V6 Naturally Aspirated Engine)

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   Fig 3: Adjusting Fuel Low-Pressure Line

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Connect the tester to the low-pressure hose on the body side. The setup must be fully sealed. → Measuring tool set-up (turbo engine)  → Measuring tool set-up (naturally aspirated engine) 
   Fig 4: Connecting Tester To Low-Pressure Hose On Body (Turbo Engine)

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   Fig 5: Connecting Tester To Low-Pressure Hose On Body (Naturally Aspirated Engine)

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. Hold the free end of the hose downstream of the pressure reducer into a large measuring container (recommended volume of 5 liters). → Delivery rate test in measuring tub or bucket 
   Fig 6: Measuring Tub Or Bucket Of Delivery Rate

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
4. Connect the Tester and get it ready. PIWIS Tester II 9818 
   1. 4.1. Connect charger to the vehicle battery. The voltage should be approx. 12.5 V (no rapid charging allowed because the voltage is too high!).
   2. 4.2. The fuel pump can be activated and deactivated as follows:
   3. 4.3. [Diagnostics] => [Panamera] => [DME] => [Drive] link test/checks => [Drive] links => [Fuel] pump 1
   4. 4.4. 100% is displayed. The fuel pump starts to deliver fuel when you press [Start.
   5. 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 liters a minute  .