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Procedure
– Pull fuel supply hose (white marking) and fuel return hose
(blue marking) off tandem pump.
– Seal fuel return union on tandem pump with a plug. Secure
sealing plug with a spring-type clip.
Prepare test unit -V.A.G 1687- as follows:
– Unscrew pressure regulating valve -2- and close valves -3-
and -4-.
– Connect test connection -5- to fuel supply union of tandem
pump using a commercially available compressed air connec‐
tion and a section of fuel hose. Use a spring-type clip to secure.
Note
To turn the pressure regulating valve -2- the knob must be pulled
upwards.
– Connect compressed air hose -1- (compressed air source) to
charge air system tester -V.A.G 1687- .
Note
If there is water in the sight glass, drain at water drain screw -6-.
– Open valve -3-.
– Adjust pressure to 1.0 bar with pressure regulating valve -2-.
Caution
The maximum test pressure is 1.3 bar and this must not be
exceeded.
– Open valve -4- and wait until the test circuit is filled. If neces‐
sary readjust pressure to 1.0 bar.
– Close valve -3- to retain pressure and observe the pressure
drop over a period of 1 minute.
If the pressure does not drop the tandem pump can be reused, if
the pressure drops the tandem pump must be renewed.
7.2 Removing and installing tandem pump
DANGER!
The tandem pump may, under no circumstances, be disman‐
tled as the vacuum part could otherwise malfunction. This
would result in the failure of the brake servo.
Golf 2004 ➤ , Golf Plus 2005 ➤ , Passat 2006 ➤ , Touran 2003 ➤
4-cylinder diesel engine (2.0 l engine, 4 valve) - Edition 02.2011
7. Tandem pump 227
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