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Checking for internal leaks > < Checking tandem pump

Golf Mk5

Checking delivery pressure
Checking delivery pressure
Special tools and workshop equipment required
t  Tandem pump tester -VAS 5187-
   
t  Torque wrench -V.A.G 1331-
Test prerequisites
l  Coolant temperature must be at least 85 °C.
l  Unit injectors OK
l  Fuel filter and fuel lines must not be blocked.
Procedure
–  Remove air filter housing.
  W00-0427
–  Remove plug -arrow-.
  N20-10008
–  Connect tandem pump tester -VAS 5187- if necessary, with adapter -VAS 5187/7- or banjo bolt with seal -VAS 5187/1A- as shown.
–  Remove air filter housing again.
–  Start engine and raise engine speed to 4000 rpm.
–  Observe pressure indicated on pressure gauge.
Specification: min. 10.5 bar, tandem pump OK.
If the specification is not attained:
–  Renew fuel filter.
–  Repeat check.
If the specifications are still not attained:
–  Using a hose clip, clamp-off return line between fuel filter and tandem pump.
–  Repeat check.
If specification is now obtained:
–  Tandem pump is OK. Renew unit injector O-rings → Chapter.
If the specification is not attained:
–  Renew tandem pump → Chapter.
  Note
After removing pressure tester, tighten plug to 25 Nm. Always renew seal.
  N20-10009

Checking for internal leaks > < Checking tandem pump