2002 Audi S8FACTORY OEM SERVICE PROCEDURE

Fuel Pump

FUEL PUMP PERFORMANCE (1.8L - TT)

Application Specification
System Pressure
With Engine Idling (1) 44 psi (3.0 bar)
With Engine Idling (2) 36 psi (2.5 bar)
Residual Pressure (3) 22-36 psi (1.5 bar)
Min. Vol. In 30 Sec.
Engine Code AMU 5.6-6.2 ozs. (165-183 ml.)
Engine Codes ATC & AWP 4.5-5.3 ozs. (133-157 ml.)
(1) With fuel pressure regulator vacuum hose disconnected.
(2) With fuel pressure regulator vacuum hose connected.
(3) After 10 minutes.
FUEL PUMP PERFORMANCE (3.0L)

Application Specification
System Pressure
With Engine Idling (1) 46-55 psi (3.2-3.8 bar)
With Engine Idling (2) 55-61 psi (3.8-4.2 bar)
Residual Pressure
Cold Engine (3) 32 psi (2.2 bar)
Warm Engine (3) 44 psi (3.0 bar)
Min. Vol. In 30 Sec. 3.0-4.2 ozs. (90-125 ml.)
(1) With fuel pressure regulator vacuum hose connected.
(2) With fuel pressure regulator vacuum hose disconnected.
(3) After 10 minutes.
FUEL PUMP PERFORMANCE (4.2L)

Application Specification
System Pressure
With Engine Idling (1) 50 psi (3.5 bar)
With Engine Idling (2) 58 psi (4.0 bar)
Residual Pressure (3) 36 psi (2.5 bar)
Min. Vol. In 30 Sec. 3.2-3.9 ozs. (95-115 ml.)
(1) With fuel pressure regulator vacuum hose connected.
(2) With fuel pressure regulator vacuum hose disconnected.
(3) After 10 minutes.
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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.