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.
1991 Audi 100 BaseFACTORY OEM SERVICE PROCEDURE
Main Pump Delivery Volume (2.2L)
- Check transfer pump (if equipped) and fuel filter. Disconnect fuel return line and place open end in measuring container. Activate fuel pump with jumper switch. Check fuel pump delivery volume for 30-second period.
- Minimum delivery volume is .71 qt. (.68L) in 30 seconds. With engine off and fuel pump activated with jumper switch, measure voltage at fuel pump. Voltage should be 11.4 volts.
Factory Service Tools
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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.