Checking Fuel Pressure: Notes

→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapors.

→ Attach warning sign in a clearly visible position.

→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapors.

→ Attach warning sign in a clearly visible position.

1. Attach or mount a warning sign in a clearly visible position on the vehicle.
   Fig 1: Example Of Warning Sign

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   Information 

   The battery voltage must not fall below 11 volts during the check.

2. Check the battery charge state using a voltmeter or the Porsche PIWIS Tester 9718  (Supply voltage menu item).

   Connect a battery charger if necessary.

3. Screw off cap -arrow-  on the fuel filter test connection.
   Fig 2: Locating Fuel Filter Screw Off Cap

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4. Connect pressure gauge Pressure Gauge P378A  to the Connecting Line 9705/2  and screw the line onto the valve by hand (knurled nut).
   Fig 3: Connecting Pressure Gauge Connection

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5. PIWIS Tester 9718  with the adapter line must be connected to the input socket in the vehicle. Switch on ignition and switch off all loads (radio, air conditioning, etc.).
6. Switch on the Porsche PIWIS Tester 9718  , select Diagnosis  and then highlight the vehicle 911 (997)  .
   Fig 4: Selecting Vehicle Screen Display

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7. Run the individual control unit search for the engine control unit. To do this, select the DME  line with the tracer pen and press [F12] >>.
   Fig 5: Activating Control Unit Screen Display

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   Information 

   • The fuel system of the 997 Turbo, 997 GT2 and 997 GT3 has two electric fuel pumps (EKP). 
   • The delivery rate volume and supply pressure of these pumps must be checked individually. 
   • These can be activated individually in the PIWIS Tester 9718. 
8. Select the Drive links item and then select fuel pump relay 1 with the tracer pen.
   1. 8.1. Press [F8=Start] to activate fuel pump 1 (EKP 1)  .
      Fig 6: Drive Link For Fuel Pump Relay 1 Screen Display

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9. Read off pressure shown on pressure gauge.

   Nominal value with the engine off: 3.9 ± 0.3 bar 

   1. 9.1. Deactivate the fuel pump by pressing [F8=Stop].
10. Repeat the process for fuel pump 2 (EKP 2)  .

    Nominal value with the engine off: 3.9 ± 0.3 bar 

11. Switch off ignition, switch off Porsche System Tester and disconnect adapter line in the passenger compartment.
12. Remove pressure gauge.
    1. 12.1. Wrap a cloth around the test connection to absorb emerging fuel. Wear fuel-resistant protective clothes and goggles.
    2. 12.2. Loosen and unscrew knurled nut on connecting line and remove pressure gauge.
    3. 12.3. Screw protection cap onto the valve and tighten hand-tight.