Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVE/INSTALL/OVERHAULFUEL SYSTEMFUEL PUMPREMOVAL & INSTALLATION (A4 FRONT WHEEL DRIVE ONLY)
1998 Audi A4 Avant Quattro, Automatic
Removal & Installation (A4 Front Wheel Drive Only)
1998 Audi A4 Avant Quattro, AutomaticSECTION Removal & Installation (A4 Front Wheel Drive Only)
- Observe fuel system warnings and notes. Turn ignition off and remove ignition key from vehicle. Disconnect negative battery cable. Working in luggage compartment, remove fuel pump access plate. Note orientation of fuel lines. Mark and remove fuel lines. See Fig 1 . Disconnect fuel pump and fuel level sensor harness connector. Using Union Nut Wrench (3217), remove union nut. Remove cover flange and "O" ring seal. Disconnect fuel level sensor harness connector from inside of flange cover. Disconnect return line from inside of cover flange. See Fig 2 .
- Insert Fuel Pump Wrench (3307) through opening in fuel tank, turn inner section of surge housing about 15 degrees to the left. See Fig 3 . Remove fuel pump assembly through opening. Remove supply line from fuel pump. Remove power and ground wires from fuel pump.
- Install new fuel pump to inner surge housing. Connect power and ground wires to fuel pump. Connect fuel supply line to fuel pump. Install fuel pump assembly through opening. Place inner surge housing into outer surge housing so that notch (1) on inner housing matches mark (2) on outer surge housing. See Fig 4 . When installing inner surge housing an audible click should be heard when housing is seated. Using fuel pump wrench turn inner surge housing about 15 degrees to the right. Notch (1) on inner housing should now match mark (3) on outer surge housing.
- Connect return line and fuel level sensor harness connector to cover flange. Using NEW "O" ring seal install cover flange. Install union nut, using union nut wrench torque nut to 44 ft. lbs. (60 N.m). Connect harness connector and fuel lines. Re-install cover plate. Connect negative battery cable. Reprogram radio, clock and power windows as necessary.
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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.