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HOMESERVICE MANUALSAUDI1999A6 BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALFUEL SYSTEMFUEL SUPPLY SYSTEM - ALL ENGINESFUEL SUPPLY, FRONT WHEEL DRIVE (FWD)FUEL PUMP DELIVERY RATE, CHECKINGTEST SEQUENCE
1999 Audi A6 Base

Test sequence

1999 Audi A6 BaseSECTION Test sequence
  • Open fuse box cover on left side of the instrument panel.
  • Pull fuse No. S228 off fuse holder (left row, 5th large fuse from top).
  • Connect remote control V.A.G 1348/3A with adapter lead V.A.G 1348/3-2 to right-hand fuse socket of fuse No. 28-arrow.
    Fig 1: Connecting Remote Control V.A.G 1348/3A To Right-Hand Fuse Socket Of Fuse No.28
    G02721582Courtesy of AUDI OF AMERICA, INC.
  • Connect clamp to vehicle battery (+ ).
  • Remove filler cap from fuel tank filler neck.
  • Remove engine cover -arrow-.
    Fig 2: Removing Engine Cover
    G02721583Courtesy of AUDI OF AMERICA, INC.
WARNING:
  • Fire Hazard! Do not smoke, work near heaters or have anything in the area that could ignite the fuel or fumes.
  • Fuel supply lines are under pressure! Before loosening any lines, cover the connection with a rag. Release the pressure by slowly separating the connection.
  • Disconnect fuel return hose from fuel rail.
  • Connect extension (test) hose -arrow- to fuel rail and hold end of hose in measuring container.
    Fig 3: Holding End Of Extension (Test) Hose In Measuring Container
    G02721584Courtesy of AUDI OF AMERICA, INC.
  • Operate remote control for 15 seconds (keep button pressed).
  • Compare the quantity of fuel delivered with specification.

    *) Minimum delivery cm3 /15 seconds

    **) Voltage at fuel pump with engine stationary and pump running (approx. 2 volts less than battery voltage).

    Fig 4: Fuel Pump Voltage Versus Fuel Delivered Graph
    G02721585Courtesy of AUDI OF AMERICA, INC.
  • Connect fuel return line with new hose clamp.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.