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.
1990 Audi 200 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Residual Pressure & Internal Leak Testing
- Open valve on pressure gauge. Operate fuel pump for 30 seconds. Pressure can drop to a minimum of 38 psi (2.7 kg/cm2
) after 10 minutes. If pressure drops below specified value, inspect fuel pump check valve and all fuel fittings for leakage.NOTE: Pressure and leak testing DOES NOT include checking cold start valve.
- If there are no leaks, check sensor plate clearance. If plate clearance is correct, replace regulator assembly and repeat leak test. If pressure drop is not within specification, replace fuel distributor "O" rings.
Factory Service Tools
Use the Manual With the Right Hardware
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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.