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Home >> Audi >> 1998 >> A4 Base, 1.8 B, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Specifications >> Engine Controls - Specifications >> Fuel System >> Fuel Pump
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Fuel Pump

FUEL PRESSURE SPECIFICATIONS

Function Specification
System Pressure
With Engine Idling (1) 50 psi (3.5 bar)
With Engine Idling (2) 58 psi (4 bar)
Residual Pressure (3) 36 psi (2.5 bar)
(1) With fuel pressure regulator vacuum hose connected.
(2) With fuel pressure regulator vacuum hose disconnected.
(3) After 10 minutes.
FUEL PRESSURE SPECIFICATIONS

Function Specification
System Pressure
With Engine Idling (1) 55-61 psi (4.0-4.2 bar)
With Engine Idling (2) 48-54 psi (3.3-3.7 bar)
Residual Pressure
Cold Engine (3) 32 psi (2.2 bar)
Warm Engine (3) 44 psi (3.0 bar)
(1) With fuel pressure regulator vacuum hose disconnected.
(2) With fuel pressure regulator vacuum hose connected.
(3) After 10 minutes.
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