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 MANUALSAUDI199590 BASE, 2.8 K, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL DELIVERYFUEL PUMP CIRCUIT WITHOUT SCAN TESTER
1995 Audi 90 Base, 2.8 K, Automatic
Fuel Pump Circuit Without Scan Tester
1995 Audi 90 Base, 2.8 K, AutomaticSECTION Fuel Pump Circuit Without Scan Tester
- Ensure fuse No. 13 is okay. See ELECTRICAL COMPONENT LOCATIONS . Ensure fuel filter is okay and battery is fully charged. While operating starter for several seconds, measure voltage at fuse No. 13.
- If battery voltage is not present, go to next step. If battery voltage is present, check for open circuit between fuse No. 13 and fuel pump, and between fuel pump and ground. If circuit is okay, replace fuel pump.
- Check fuel pump relay. See FUEL PUMP RELAY - WITHOUT SCAN TESTER. If fuel pump relay is okay, remove it. Turn ignition on. Check voltage at fuel pump relay terminals No. 46 and 48. See Figure . If battery voltage is not present, repair relay power supply circuit.
- If battery voltage is present, check for open circuit between fuel pump relay connector terminal No. 52 and fuse No. 13. If circuit is okay, check for open circuit between fuel pump relay connector terminal No. 47 and PCM. If circuit is okay, replace PCM.
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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.