A4 Mk1
Servicing Motronic fuel injection system
Testing fuel pressure, pressure regulator and holding pressure
Test requirements:
Note: Fuel pressure regulator regulates fuel pressure as a function of intake pressure. |
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Note: The shut-off cock of the pressure measuring device must be open (lever facing in the direction of flow).
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If the holding pressure drops below 2.5 bar:
If the holding pressure does not drop, the following faults are possible:
If the pressure drops again, the following faults are possible:
Note: To remove the pressure gauge, close the shut-off valve, unscrew the union on adapter V.A.G 1318/12, then open the shut-off valve to drain off excess fuel into a suitable container. |