Jetta L4-2.0L (BEV) (2004)
After 10 minutes there must be a residual pressure of at least 2.0 bar.
If the pressure drops below 2 bar.
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Start engine and run at idling speed.
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Switch ignition off after pressure has built-up. Simultaneously close pressure gauge V.A.G 1318 cut-off tap (handle cross through-flow direction
-arrow-).
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Observe pressure drop (engine side) on gauge.
If the pressure drops again:
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Check line connections, O-rings on fuel manifold and injectors for leaks.
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Check pressure gauge for leaks.
NOTE: Before removing pressure gauge place a cloth around the connections to be loosened.
If the pressure does not drop.
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Check non-return valve of fuel pump. See: Fuel Pump/Testing and Inspection/Fuel Pump, Checking - II
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Check fuel pressure regulator.
Checking fuel pressure regulator
Requirements
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Non-return valve for fuel pump OK.
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Fuel pump supply line OK.
Work sequence
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Remove cover in front of fuse holder.
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Remove fuse 28 (fuel pump) from fuse holder.