Scheme 1
| No. | Designation | Special tool |
|---|---|---|
| A | Pressure gauge | P378a |
| B | Connection line | 9559 |
SPECIAL TOOL CHART
Scheme 2
Scheme 3
- Undo covering cap on test connection of fuel collection pipe and remove.
- Connect pressure gauge (special tool P 378a) with connecting line (special tool 9559) and connect to test connection.
- Actuating fuel pump with Porsche System Tester 2: The fuel pump can be actuated with the Porsche System Tester 2 or by bridging the fuel-pump relay. Via 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) with a fused shop-made cable. (Scheme 3) The fuel pump must now operate or deliver fuel.
- 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 Nm (2.0 +/-0.5 ftlb.).