Golf III L4-2.0L (ABA) (1995)
Fuel Pressure Regulator: Testing and Inspection
CHECKING FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE
REQUIREMENTS
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Fuel Pump delivery quantity OK.
WARNING: To prevent fuel spray and a potential fire hazard when loosening connecting points, place rags around respective connection.
PROCEDURE
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Unscrew cap screw from measuring port and connect VAG 1318 gauge with VAG 1318/10 adapter.
CAUTION: Shut-off lever on tester must be closed. Lever must be at right angle to direction of flow (arrow).
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Start engine and let engine idle.
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Measure fuel pressure.
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Specified value: approx. 2.5 bar (36 psi).
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Disconnect vacuum hose -1- from connector line -2-.
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Fuel pressure must increase: approx. 3.0 bar (43 psi).
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Switch ignition OFF.
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Check for leaks and residual pressure by watching for pressure drop on gauge.
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After 10 minutes, at least 2 bar (29 psi) pressure must still remain.
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If it does not:
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Start engine and let idle.
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After pressure builds up, switch ignition off and simultaneously clamp return hose (hose has arrow pointing away from fuel rail).
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Watch whether pressure drops on gauge.
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If it does not: