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Volkswagen Workshop Service and Repair Manuals

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Bleeding fuel system > < Checking current draw

Golf Mk5

Checking non-return valve for fuel pump
Checking non-return valve for fuel pump
–  Open cover of relay and fuse holder of E-box in engine compartment.
–  Pull fuse SB6 on socket F6 off hose holder. Fuse assignment → Current flow diagrams, Electrical fault finding and Fitting locations
   
–  Connect remote control -V.A.G 1348/3 A- with adapter cable -V.A.G 1348/3-3- to left terminal (viewed looking forwards) of fuse socket F6 -arrow-.
–  Tape off 2nd connector contact of adapter cable -V.A.G 1348/3-3- with insulating tape to prevent short circuits.
–  Connect crocodile clip to vehicle battery (+).
  WARNING
The fuel system is pressurised! Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
  N24-10235
–  Pull fuel supply line -arrow- off fuel filter.
  N20-10629
–  Connect pressure tester -VAS 6550- to fuel supply line with adapter -VAS 6550/1-. Hold adapter -VAS 6550/2- in a measuring container.
–  Close pressure gauge -VAS 6550- shut-off tap -A- (lever at right angles to direction of flow).
–  Operate remote control at short intervals until a pressure of approx. 4 bar has built up.
  WARNING
Danger of spray when shut-off tap is opened. Wear eye protection and protective clothing to avoid injuries and skin contact. Hold container before free connection of pressure tester.
–  If pressure builds up too high, relieve excess pressure by carefully opening shut-off tap.
–  Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3 bar.
If the pressure drops further:
–  Check line connections for leaks.
If no fault in lines is detected:
–  Fuel pump non-return valve is defective, renew fuel delivery unit → Chapter.
  N20-10632

Bleeding fuel system > < Checking current draw