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Home >> Porsche >> 2021 >> Panamera Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (20 Fuel Supply, Actuator 3.0L Turbo -- 971 - PANAMERA (971)) >> WM, 200201 Checking Fuel Pressure (Petrol) >> Checking Fuel Pressure

Checking Fuel Pressure

WARNING: This page is about a different car, the 2020 Porsche Panamera, 2019 Porsche Panamera, 2018 Porsche Panamera, and 2017 Porsche Panamera. However, it is still accessible from the selected car via links, so may be relevant.
  1. > 9900 - PIWIS tester 3  must be connected and switched on.
  2. Switch on ignition (fuel pump is activated briefly).
  3. Perform fuel pressure test using > 9900 - PIWIS Tester 3  .
    1. 3.1 Select the Diagnostics  function.
    2. 3.2 Select the DME  control unit in the control unit overview.
    3. 3.3 Switch to the Drive links/checks  menu item.
    4. 3.4 Select the Drain fuel tank  function and press F12 = Next.
    5. 3.5 Activate the Drain fuel tank  (= activate fuel pump) function by pressing F8 = Start. The process can be ended at any time by pressing F8 = Stop.
    6. 3.6 Read off the pressure shown on the pressure gauge.

      Check fuel pressure: 

      > Fuel pressure 6.5 bar +/- 0.2 bar 

    7. 3.7 Deactivate the Drain fuel tank function by pressing F8 = Stop.
      1. 3.7.1 Exit the function.
    8. 3.8 Switch off ignition, switch off > 9900 - PIWIS Tester 3  and disconnect adapter line in the vehicle.
    9. 3.9 Perform holding pressure test. 
      1. 3.9.1 System pressure must only drop by max. 1 bar after 30 minutes. 

        > Pressure 5.5 bar +/- 0.2 bar 

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