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Leon Mk1

Test sequence
Test sequence
  Caution
Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
   
–  Pull off supply pipe/hose -1- and collect leaking fuel with a cloth.
  E24-0015
–  Connect pressure gauge -V.A.G 1318- to fuel supply pipe and to fuel rail using adapters -V.A.G 1318/9- and -V.A.G 1318/17-.
–  Open shut-off tap on pressure gauge. The handle points in direction of flow.
–  Start the engine and run at idling speed.
–  Measure fuel pressure.
   Specification: Approx. 2.5 bar
  E24-0016
–  Pull the vacuum hose off fuel pressure regulator -arrow-. The fuel pressure must increase to approx. 3.0 bar.
If the specification is not obtained:
–  Check quantity supplied by fuel pump → Chapter.
If the specification is attained:
–  Switch off ignition.
–  Check for leaks and holding pressure by observing pressure drop on gauge. After 10 minutes there must be a residual pressure of at least 2.0 bar.
If the holding pressure drops below 2 bar:
–  Start the engine and run at idling speed.
  E24-0034
–  Switch ignition off after the pressure has built-up. At the same time close pressure measured device cut-off tap (handle cross throughflow direction -arrow-).
–  Observe pressure drop on gauge.
If the pressure does not drop:
–  Check fuel pump non-return valve → Chapter.
If the pressure drops again:
  N24-0618
–  Open pressure tester -V.A.G 1318- shut-off tap (handle in throughflow direction).
–  Start the engine and run at idling speed.
–  Switch ignition off after the pressure has built-up. At the same time pinch/seal the return hose together.
If the pressure does not drop:
–  Renew fuel pressure regulator
If the pressure drops again:
–  Check pipe connections, O rings on fuel manifold and injectors for leaks.
–  Check pressure gauge for leaks.
  Note!
Before removing pressure gauge place a cloth around the connections to be loosened.
  E24-0016

Engine control unit > < Checking components