A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
Fuel Pressure: Testing and Inspection
Fuel Pressure Test
Fuel Pressure Test
Special tools, testers and auxiliary items required
‹› multimeter.
‹› fuel line adapter set (V.A.G. 1318/17A). These tools may be substituted with an equivalent aftermarket tool and are also available for rental or
purchase through Audi.
‹› In- line fuel pressure gauge with shutoff valve. (high pressure).
Test conditions
‹› Battery voltage 12.5 V
‹› Function and voltage supply for the Fuel Pump is OK.
‹› Fuel tank at least 1/4 filled.
‹› Ignition switched off.
Test procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
CAUTION!
Fuel system is under pressure! Before opening the system, place rags around the connection area. Then release the pressure by carefully
loosening the connection.
Start diagnosis
-
Disconnect fuel supply line - 3 - at the supply location and catch any fuel coming out with a shop towel
‹› Pull circlip upward to unlock fuel line
-
Install a fuel pressure gauge with appropriate adapters.
-
Open shut off valve on fuel gauge.
-
Switch ignition on and off repeatedly until fuel pressure stops increasing pressure.
-
Read fuel pressure on the gauge.