audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 1355 > < Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 1353
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Connect an assisting hose - arrow - to pressure gauge and hold it in a measuring container.

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Open shut-off valve of pressure gauge.

‹› The lever points in direction of flow.

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Bleed fuel system by pressing remote control briefly.

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Close shut-off valve of pressure gauge.

‹› Lever stands perpendicular to direction of flow - arrow -. 

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Hold switch of remote control until no more pressure increase is observed on fuel pressure gauge.

‹› Specified value: approximately 5.5 bar (4.5 to 6.5 bar) positive pressure. 

If specification is not obtained:

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Check delivery quantity of Fuel Pump (FP).

Residual Pressure, Checking

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Check for leaks and residual pressure by observing pressure drop on pressure gauge.

‹› After 10 minutes there must be a residual pressure of at least 3.75 bar.

If residual pressure drops below 3.75 bar:

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

Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 1355 > < Fuel Pressure and Residual Pressure Before High Pressure Pump, Checking|Page 1353