Check Fuel Pressure

1. Undo and remove the closure cap of the fuel collection pipe test connection (A/F 13 mm).
2. Connect pressure gauge (special tool P 378a) to connecting line (special tool 9559) and connect to test connection.
   Fig 1: Connecting Pressure Gauge & Connecting Line To Test Connection

   Courtesy of PORSCHE OF NORTH AMERICA, INC.
3. Actuate fuel pump, either:
   • with Porsche System Tester 2  . The fuel pump can be actuated with the Porsche System Tester 2 or by jumpering the fuel pump relay.

or

• via fuel pump relay without tester  . Disconnect the fuel pump relay from the central electrical system and jumper plug-in contacts 30 and 87 (identification 3 and 5 on central electrical system) with a fused shop-made cable. The fuel pump must now operate or deliver fuel.
  Fig 2: Actuating Fuel Pump

  Courtesy of PORSCHE OF NORTH AMERICA, INC.
• Nominal test values:
  • Stationary engine 3.8 +/- 0.2 bar
  • Engine idling 3.3 +/-; 0.2 bar
    NOTE: The seal or sealing ring in the brass closure cap is not  exchangeable. It must therefore be used only once  .

    Tightening torque of new brass closure cap 2.5 +/- 0.5 N.m (2.0 +/- 0.5 ft. lbs).