968 Cabriolet L4-2990cc 3.0L DOHC (1993)
Fuel Pressure: Testing and Inspection
NOTE: The left-hand fuel collection pipe has a test connection at cyl. no. 3.
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Unscrew the cap nut of the test connection.
CAUTION: The inserted ball seat could fall out!
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Connect pressure gauge P 378 or VW 1318 to the test connection. Start engine.
Test pressure 3.3 ±O.2 bar (48 ±3 psi) @ Idle speed
In case of hot starting problems:
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Check with engine stopped and fuel pump running. For the test, remove fuel pump relay and jumper terminal 87b and terminal 30.
Test pressure 3.8 ±O.2 bar (55 ±3 psi)
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Switch off fuel pump. Read off pressure on pressure gauge (nominal 3.8 O.2 bar).
Max. permissible pressure drop with warm engine: 0.5 bar (7.25 psi) in 30 minutes.
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If the pressure drops below the specified value, proceed as described below:
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Build up pressure again by switching on the fuel pump briefly. Remove return pipe from pressure regulator (fuel pump must not be switched on).
