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CC 2012 ➤ , Passat 2011 ➤ , Passat Variant 2011 ➤
Fuel supply system, petrol engines - Edition 05.2019
– Ensure that drain tap -C- is closed and shut-off taps -A- and
-B- on pressure tester - VAS 6550- -1- are open.
– After pressure has built up, close shut-off tap -B- of pressure
tester immediately. Lever is then at right angle to direction of
flow.
If pressure drops again (leak on fuel tank side):
Leak must be sought on fuel tank side; proceed as follows:
– Check fuel lines in engine compartment for leaks ⇒ Rep. gr.
24 ; Injection system; Assembly overview - fuel system .
If no fault is detected, check holding pressure of fuel delivery unit.
– Proceed as described on
If the pressure does not drop now (leak on engine side):
Note
Search for leak on engine side. Repeat holding pressure check.
This time, close shut-off tap -A- to check whether leak actually is
on engine side.
– Check holding pressure again, but this time close shut-off tap
-A-.
– If there are leaks on engine side, check the outside of fuel
pipes and high-pressure pump for leaks ⇒ Rep. gr. 24 ; In‐
jection system; Assembly overview - fuel system .
If no fault can be determined, check the injectors for leaks:
– Remove spark plugs ⇒ Rep. gr. 28 ; Ignition system; Assem‐
bly overview - ignition system .
– Open shut-off valves -A- and -B-.
– Actuate fuel pump with
– Check through spark plug holes whether fuel has collected on
the piston crown due to a leaking injector.
Checking residual pressure at flange for delivery unit
– Remove bench seat ⇒ General body repairs, interior; Rep. gr.
72 ; Rear seats; Removing and installing bench seat/individual
seats .
– Guide carpet out and fold upwards, if fitted.
– Remove right cover with fuel pump control unit - J538- -2- from
assembly opening above fuel delivery unit.
86
Rep. gr.20 - Fuel supply system
⇒ page 86
to do this.
final control diagnosis
.
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