Allroad Quattro V8-4.2L (BAS) (2004)
Fuel Pressure: Testing and Inspection
Fuel Pressure Regulator And Holding Pressure, Checking
Special tools and equipment required
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V.A.G 1318 with V.A.G 1318/6 and V.A.G 1318/7
Conditions
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Fuel pump relay OK
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Fuel pump OK
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Fuel filter OK
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Battery voltage at least 11 V
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Vehicles with automatic transmission: Selector lever in P or N position
NOTE: The fuel pressure regulator regulates the fuel pressure according to intake manifold pressure.
WARNING: The fuel system is pressurized. Before loosening hose connections or opening the test connection (to measure fuel pressure), place a cloth
around the connection. Then release pressure by carefully pulling off the hose or cap.
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Briefly open fuel tank filler cap (to release pressure).
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Cover pressurized union with a cloth.
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Open union (arrow) and catch escaping fuel with a cloth.
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Connect pressure tester V.A.G 1318 with adapters V.A.G 1318/6 and 1318/7 between supply line and fuel rail.
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Open cut-off valve on pressure gauge (valve handle points in direction of flow).
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Start engine and run at idling speed.
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Measure fuel pressure.
Specification: approx. 3.5 bar