Checking Fuel Pump - Volkswagen Golf 2004 Workshop Manual

– Open locking ring using fuel tank sender wrench -3087- .
– Lift sender flange.
– Insert extraction hose of fuel extractor -VAS 5190- as deeply
as possible into fuel tank and extract fuel.
If fuel tank needed only to be emptied, reinstall sender flange
⇒ page 210 .
5.5

Checking fuel pump

Note
Check fuel filter connections for correct arrangement, before
starting to check the fuel pump
5.5.1 Checking delivery pressure of fuel pump
Special tools and workshop equipment required
♦ Pressure gauge -VAS 6550-
♦ 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.
– 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 216 .
Golf 2004 ➤ , Golf Plus 2005 ➤ , Passat 2006 ➤ , Touran 2003 ➤
4-cylinder diesel engine (2.0 l engine, 4 valve) - Edition 02.2011
⇒ page 173
On/Off
⇒ page 225 .
5. Parts of fuel supply system (Passat)
215