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 PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL PUMP RELAYA4 (1.8L TURBO) FUEL PUMP RELAY FUNCTION
1998 Audi A4 Avant Quattro, Automatic
A4 (1.8L Turbo) Fuel Pump Relay Function
1998 Audi A4 Avant Quattro, AutomaticSECTION A4 (1.8L Turbo) Fuel Pump Relay Function
- Fuel pump relay is located in position No. 6 of relay panel located under left side of instrument panel. See Figure . Remove fuel pump relay. Remove cover from end of left side of dashboard. Remove fuses No. 28, 29 and 34.
- Connect VAG 1527B voltage tester between either terminal for fuse No. 28 and ground. Briefly operate starter motor. Fuel pump relay must audibly click and be felt energizing. Also, voltage tester should light up. If voltage tester does not light up, go to next step. If fuel pump relay does not operate, check and repair fuel pump relay power supply as necessary. See WIRING DIAGRAMS article.
- Connect voltage tester to other terminal for fuse No. 28. Repeat step 2). If voltage tester still does not light up, repair wiring harness between fuse No. 28 and terminal No. 30 of fuel pump relay connector. See Figure . Also, refer to the wiring diagrams in the appropriate WIRING DIAGRAMS article.
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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.