Volkswagen Golf 2004 Workshop Manual page 173

– Separate quick release coupling -A- (black or black marking)
of fuel supply line.
– Connect pressure tester -VAS 6550- with cables -VAS 6550/1-
and -VAS 6550/2- to open ends of fuel supply line.
– Switch on pressure tester -VAS 6550- by pressing
button.
– Open shut-off taps „A" and „B" of pressure tester and close
shut-off tap „C".
– Start engine and run at idling speed.
– Read pressure on pressure tester -VAS 6550- . Specification:
min. 0.5 bar.
– Place pressure tester -VAS 6550- onto windscreen so that it
can be read from inside vehicle.
– Increase idling speed to 2500 rpm and read the pressure on
pressure tester -VAS 6550- , specification min 0.25 bar.
– If the delivery pressure temporarily drops, renew fuel delivery
unit ⇒ page 210 .
– If the specifications are attained, check tandem pump to en‐
sure the fuel filter is not blocked
– If the tandem pump values are OK, check fuel pump delivery
rate ⇒ page 167 .
3.6.2 Checking fuel pump delivery rate
Special tools and workshop equipment required
♦ Pressure gauge -VAS 6550-
♦ Container > 3 litre with measuring scale
♦ Vehicle diagnosis tester
Test prerequisite:
• Fuses must be OK.
• Battery voltage at least 12 V
• 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 ig‐
nored.
Golf 2004 ➤ , Golf Plus 2005 ➤ , Passat 2006 ➤ , Touran 2003 ➤
4-cylinder diesel engine (2.0 l engine, 4 valve) - Edition 02.2011
On/Off
⇒ page 225 .
3. Parts of fuel supply system (Golf, Golf Plus)
167