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Checking fuel delivery rate of metering pump V54 > < Fuel delivery unit in fuel tank

A4 Mk3

Filling fuel pipe to metering pumpV54 with fuel (bleeding)
Filling fuel pipe to metering pump -V54- with fuel (bleeding)
  Note
t  Air/fuel vapour in the auxiliary heater fuel supply can lead to problems in auxiliary heater operation. To stop air/fuel vapour being drawn in by the metering pump -V54- and conveyed to the auxiliary heater when the auxiliary heater is first switched on after working on the fuel tank or fuel delivery unit, the fuel diversion pipe is to be filled with fuel (bled) after working in this area.
t  The following illustration shows the positions of the components on an Audi A5 Coupé. The layout differs slightly on the Audi A4 and Audi Q5. The components are however to be bled in the same manner as described for the Audi A5 Coupé.
t  After working on the fuel system, switch on the auxiliary heater and let it run for some time in full load mode to check operation (at least 10 minutes).
l  Auxiliary heater switched off (the metering pump -V54- is not actuated).
–  Switch off ignition.
   
–  Unfasten the quick-release coupling -1- → Chapter.
–  Connect the quick-release coupling -1- of the fuel pipe to the diesel extraction unit -VAS 5226-.
–  Connect the diesel extraction unit -VAS 5226- to the workshop compressed air system → Fuel supply system; Rep. Gr. 20.
–  Completely fill the fuel pipe with fuel by briefly extracting the air.
–  Connect the fuel pipe with the quick-release coupling -1- to the metering pump -V54-.
–  After re-installing all the components removed, switch on the auxiliary heater and let it operate in full load mode for roughly 10 minutes.
  A82-10105

Checking fuel delivery rate of metering pump V54 > < Fuel delivery unit in fuel tank