volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Checking Fuel Pressure Regulator and Holding Pressure|Page 4967 > < Checking Fuel Pressure Regulator and Holding Pressure|Page 4965
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Pull off fuel supply line on connection -1 - and collect leaking fuel with a cloth.

NOTE:  To do this slide securing ring -2-in connection -1 -.

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Connect pressure gauge V.A.G1318 to fuel supply line and to fuel rail with adapters V.A.G 1318/9 and V.A.G 1318/17.

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Open shut-off tap on pressure gauge. Lever points in through-flow direction (position - A -).

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Refit fuse 28 (fuel pump) in fuse holder.

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Start engine and run at idling speed.

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Measure fuel pressure.

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Specification: approx. 4 bar

If the specification is not obtained:

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Switch off ignition.

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Check that fuel pump can create and maintain this pressure, Checking fuel pump non-return valve.

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Check fuel pressure regulator.

If the specification is obtained:

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Switch off ignition.

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Check for leaks and holding pressure (entire system) by observing pressure drop on gauge.

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After 10 minutes, there must be a residual pressure of at least 2.0 bar.

If the holding pressure drops below 2 bar:

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Start engine and run at idling speed.

Checking Fuel Pressure Regulator and Holding Pressure|Page 4967 > < Checking Fuel Pressure Regulator and Holding Pressure|Page 4965