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Heating, ventilation, air conditioning system > < Checking fuel pressure regulator and holding pressure (engine codes CBTA, CBUA, BGP, BGQ)

Golf Mk5

Checking fuel pump non-return valve (engine codes CBTA, CBUA, BGP, BGQ)
Checking fuel pump non-return valve (engine codes CBTA, CBUA, BGP, BGQ)
–  Remove bench seat → General body repairs, interior; Rep. gr.72.
   
–  Remove cover from fuel delivery unit.
  A20-1206
–  First check that the connector -arrow- is fitted securely by pulling the connector without pressing the catch. The connector can cause a fault if it has not been fitted correctly.
–  Now pull off connector.
–  Check the contacts on the connector and on the fuel delivery unit for damage.
  N20-10623
–  Connect test instrument adapter/DSO (5-pin) -VAS 5565- to connector and fuel delivery unit.
–  Connect remote control -V.A.G 1348/3A- to test instrument adapter/DSO (5-pin) -VAS 5565- and to battery positive (+).
  WARNING
Fuel supply line 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.
  N20-10422
–  Pull fuel supply line -arrow- off fuel filter. Separate push-on couplings → Chapter.
  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 in front of open 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 defective, renew fuel delivery unit → Chapter.
  N20-10632

Heating, ventilation, air conditioning system > < Checking fuel pressure regulator and holding pressure (engine codes CBTA, CBUA, BGP, BGQ)