A4 Mk2
Servicing Simos injection system
Checking system pressure, fuel pressure regulator and holding pressure
Special tools and workshop equipment required |
Note: The fuel pressure regulator regulates the fuel pressure according to the intake manifold pressure. This ensures that the drop in pressure at the injectors remains the same throughout all engine speed and engine load ranges. Requirements for test:
Warning
Fuel system is under pressure. Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection. Testing system pressure
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If the holding pressure drops below 2.5 bar:
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If the pressure does not drop:
If the pressure drops again:
If the pressure does not drop:
If the pressure drops again:
Note: Before removing the pressure gauge, release the fuel pressure by opening the cut-off valve. When doing this hold a container under the connection. |