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Checking voltage supply of fuel pump > < Checking delivery pressure of fuel pump

Golf Mk5

Checking fuel pump delivery rate
Checking fuel pump delivery rate
Special tools and workshop equipment required
t  Pressure gauge -VAS 6550-
t  Container > 3 litre with measuring scale
t  Vehicle diagnosis tester
Test prerequisite:
l  Fuses must be OK.
l  Battery voltage at least 12 V
l  All electrical consumers, e.g. lights and rear window heating, must be switched off.
  Note
The delivered fuel may be cloudy. This is normal and can be ignored.
   
–  Separate quick-release coupling -A- (completely black or with black marking) of fuel supply line.
–  Connect -VAS 6550/1- pressure tester line to fuel supply -A-.
–  Guide open end of line into measuring container.
–  Connect vehicle diagnosis tester and perform guided function „checking electric fuel pump(s)“.
  Note
The fuel pump is now activated for 30 seconds.
–  After fuel flow, read quantity of fuel delivered on measuring container, specification: min. 1000 ml/30 s.
If the specification is not attained:
–  Check fuel supply line between fuel pump and engine compartment for kinks, crushes or damage.
–  If necessary, renew defective line and repeat test.
–  If it is not kinked, crushed or damaged, remove rear seat bench → General body repairs, interior; Rep. gr.72.
–  Detach carpet under seats and fold it back. → General body repairs, interior; Rep. gr.70
–  Remove cover from fuel delivery unit.
  Note
Press in securing ring to release fuel line.
  N20-10436
–  Pull fuel supply line (black or black marking) -A- off fuel delivery unit.
–  Connect -VAS 6550/1- pressure tester line to fuel supply -A-.
–  Guide open end of line into measuring container.
–  Connect diagnosis tester and perform the guided function „Checking electric fuel pump(s)“.
  Note
The fuel pump is now activated for 30 seconds.
–  After fuel flow, read quantity of fuel delivered on measuring container, specification: min. 1000 ml/30 s.
If the specification is not attained:
–  Check voltage supply → Chapter and current draw → Chapter of fuel pump.
  N20-10510

Checking voltage supply of fuel pump > < Checking delivery pressure of fuel pump