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Checking return flow rate at high-pressure pump > < Check the fuel metering valveN 290,

Leon Mk2

Pressure testing high-pressure pump
Pressure testing high-pressure pump
Check the tool and equipment equivalence table according to the applicability between Seat / VW / Audi / Skoda → Chapter
Special tools and workshop equipment required
   
t  Vacuum pump -VAS 6213-, see equivalent → Anchor
  W00-10259
t  Make an -adapter- from a high-pressure line.
t  During further work this carefully cleaned adapter is to be connected to the high-pressure connection on the high-pressure pump, free of stress. 20 Nm.
l  Tests on fuel low-pressure side have been performed and were not cause for complaint.
l  Return flow rate at high-pressure pump has been checked and was not cause for complaint → Chapter.
l  Fuel tank is filled with clean fuel according to DIN EN 590.
l  Starter turning at starting speed ≥ 230 rpm. → Electrical system; Rep. gr.27
l  Observe safety precautions → Chapter.
l  Observe rules for cleanliness → Chapter.
l  Observe instructions for working on fuel system → Chapter
  N23-10482
»Carry out the following work sequence«
–  Remove high-pressure fuel line -2- between high-pressure pump and high-pressure accumulator.
  A23-10432
–  Connect cleaned, custom-made adapter to high-pressure connection on high-pressure pump, tighten to 20 Nm.
–  Connect hand-operated vacuum pump -VAS 6213- to custom-made adapter.
–  Using hand-operated vacuum pump -VAS 6213- apply pressure of min 1 bar.
If high-pressure pump is OK, pressure remains constant for 30 s.
If the high-pressure pump is defective, the pressure drops within 2 ... 3 seconds back to 0 bar.
Repeat check is necessary, observe pressure loss at hand-operated vacuum pump -VAS 6213-.
–  Replace high-pressure pump → Chapter.
  N23-10480

Checking return flow rate at high-pressure pump > < Check the fuel metering valveN 290,