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Checking fuel delivery rate > < Checking fuel pump

Golf Mk4

Checking function and voltage supply
Checking function and voltage supply
–  Remove cover from fuel delivery unit.
–  Briefly operate starter. Fuel pump must be heard to run.
–  Switch off ignition.
If the fuel pump does not start:
–  Remove fuse holder cover.
   
–  Pull fuse No. 28 out of fuse holder.
–  Connect remote control for V.A.G 1348 -V.A.G 1348/3A- with adapter cable -V.A.G 1348/3-2- to contact 28a of fuel pump and battery positive (+).
–  Operate remote control for V.A.G 1348 -V.A.G 1348/3A-.
If fuel pump runs:
–  Check activation of fuel pump relay using current flow diagram: → Current flow diagrams, Electrical fault finding and Fitting locations
If fuel pump does not run:
–  Pull 4-pin connector off fuel delivery unit flange.
  N20-0212
–  Connect voltage tester -V.A.G 1527B- to outer contacts of connector using auxiliary cables from auxiliary measuring set -V.A.G 1594C-.
–  Operate remote control for V.A.G 1348 -V.A.G 1348/3A-. LED must light up.
If LED does not light up:
–  Locate and eliminate open circuit referring to current flow diagram: → Current flow diagrams, Electrical fault finding and Fitting locations.
LED lights up (voltage supply OK):
  A20-0099
–  Unscrew union nut with union nut tool -3217-.
–  Check that electrical wires between flange and fuel pump are connected.
If no open circuit can be found:
–  Fuel pump defective, renew fuel delivery unit → Chapter.
  A20-0106

Checking fuel delivery rate > < Checking fuel pump