Checking Fuel Pressure - Engine Idling

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Open the retaining clip for the fuel lines on the underbody and unclip the supply line.
1. 1.1. To do this, open the clip using a small screwdriver.
  
  Fig 1: Opening Retaining Clip On Fuel Lines
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Open the rapid-action coupling on the fuel pressure line.
1. 2.1. Wrap a cloth around the connection point (to prevent splashes), press the two locking lugs and carefully pull the line apart.
  
  Fig 2: Identifying Rapid-Action Coupling On Fuel Pressure Line
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Connect special tool test pressure gauge with lines from K-Jetronic Tester VAG. 1318 WE 1291 to the fuel line.
1. 3.1. Engage pressure gauge on the transmission bracket using the chain.
2. 3.2. Insert connection lines into the relevant couplings.
  1. Pressure gauge
  2. Connection line no. 17 from VAG 1318 and P 378 C fitted on line to the engine
  3. Connection line no. 17 from VAG 1318 fitted on line to the fuel tank
    
    Fig 3: Inserting Connection Lines Into Relevant Couplings
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Start the engine and read off the fuel pressure on the pressure gauge.
→ Fuel pressure - engine idling: 5.0 bar+/-0.3 bar
Switch off the engine after reading the fuel pressure.
Holding pressure test:
Holding pressure after 20 minutes.

NOTE: Holding pressure as for test with engine not running.
Disconnect test connections and remove test pressure gauge.
Wrap a cloth around the connection point (to prevent splashes), press the two locking lugs and carefully pull the line apart.
1. 7.1. Connect plug-in coupling for fuel lines.
2. 7.2. The coupling must lock with an audible click. Pull to check that the connection is secure.
Information
- When the work is complete, check that all aids and foreign objects (e.g. cloths, tools) are removed from the engine compartment.
Make sure there are no tools, foreign objects or aids left in the work area.