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Fuel Pressure: Testing and Inspection
Checking Fuel Pressure
Special Tools
Test
1. Undo covering cap on test connection of fuel collection pipe and remove (width across flats
13 mm
).
2. Connect pressure gauge (special tool P 378a) with connecting line (special tool 9559) and connect to test connection.
3. Actuate fuel pump, either
with Porsche System Tester 2:
The fuel pump can be actuated with the Porsche System Tester 2 or by bridging the fuel-pump relay.
or
via the fuel-pump relay without Tester:
Disconnect fuel-pump relay from the central electrical board and bridge contacts 30 and 87 (identified as 3 and 5 on the central electrical board)
This is a source reference. Confirm exact model applicability in the original material.