A3 Mk1
Servicing Motronic injection system
Checking system pressure, fuel pressure regulator and holding pressure
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Special tools and workshop equipment required
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Note: Fuel pressure regulator regulates fuel pressure as a function of intake pressure. As a result, the pressure drop at the injectors remains constant for each engine speed and load range. Test requirements:
=> Fuel Supply - Petrol Engines; Repair group 20
Important
The fuel system is pressurised! Before opening the system place a cloth around the connection point. Then release pressure by carefully loosening the connection. |
Checking system pressure
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If the holding pressure drops below 1.5 bar:
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If the pressure now does not drop:
If the pressure drops again:
If the pressure now 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 over the connection. |