audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 2946 > < Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 2944
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Hold the switch of the remote control until no more pressure increase is observed on the fuel pressure gauge.

‹› Specified value: Approximately 6 bar positive pressure

If the specification is not obtained:

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Check the fuel pump delivery quantity.

Residual Pressure, Checking

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Check for leaks and for residual pressure by observing the pressure loss on the pressure gauge.

‹› After 10 minutes there must be a residual pressure of at least 3 bar. 

If the residual pressure drops below 3 bar:

‹› Check connection between fuel pressure gauge and fuel line for leaks. 

‹› Check pressure gauge for leaks.

‹› Check fuel lines and their connections for leaks.

‹› Replace fuel filter with integrated fuel pressure regulator.

‹› Replace fuel pump. 

Assembly is in reverse order of removal, note the following:

‹› Before disconnecting pressure gauge, release pressure by opening shut-off valve. Hold a container in front of connection for this.

‹› Tightening Specifications High pressure pump. Refer to => [ High Pressure Pump Assembly Overview ] See: Powertrain Management/Fuel

Delivery and Air Induction/Fuel Pump/Service and Repair/High Pressure Pump Assembly Overview

Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 2946 > < Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 2944