Fuel System Pressure
- Ensure fuel pump relay is okay. Ensure correct fuel filter is installed. Ensure battery voltage is at least 12 volts. Release fuel pressure. See FUEL PRESSURE RELEASE
.
- Connect Pressure Gauge (VAG 1318) between fuel supply and fuel return lines in engine compartment. See Fig 1
. Disconnect and plug vacuum line from fuel pressure regulator. Start engine, and let idle. Fuel pressure should be within specification. See appropriate FUEL PRESSURE SPECIFICATIONS table.
- If fuel pressure is within specification, connect vacuum hose to fuel pressure regulator. Pressure should drop as specified. See appropriate FUEL PRESSURE SPECIFICATIONS table. If fuel pressure is not within specification, check fuel pressure regulator, fuel pump and fuel lines and repair or replace as necessary.
Courtesy of AUDI OF AMERICA, INC.