Checking delivery pressure of fuel system pressurisation pump G6, engine code CFHC — VW

Checking delivery pressure of
fuel system pressurisation pump
G6
, engine code CFHC
Special tools and workshop equipment required
Pressure gauge
VAS 6551
Vehicle diagnostic 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.
Remove engine cover panel
Rep. gr.
10
Engine cover panel; Removing and installing engine cover panel
.
Pull engine cover panel upwards out of fastening elements in areas of
arrows
and in sequence shown.
Caution
Bracket for engine cover panel on cylinder head cover may break off if removed improperly. Remove engine cover panel according to following instructions under all circumstances.
To do this, grip beneath engine cover panel as far as possible.
Separate connection
A
(black or with black marking) of fuel supply line. Separate connectors
Chapter
.
Connect
pressure tester
VAS 6551
with cables
VAS 6551/1
and
VAS 6551/2
to open ends of fuel supply line.
Switch on
pressure tester
VAS 6551
by pressing
On/Off
push button.
Open shut-off taps
“A”
and
“B”
of pressure tester and close shut-off tap
“C”
.
Start engine and run at idling speed.
Close shut-off valve
“B”
for a maximum of 15 seconds and, during this period, take pressure reading on
pressure tester
VAS 6551
. Specification at least 0.5 bar.
If the delivery pressure temporarily drops, renew fuel delivery unit
Chapter
.
If the specifications are attained:
In the event of engine running problems, renew fuel filter to eliminate potential fuel filter blockage problem.
If the specifications are not obtained
Remove rear bench seat
General body repairs, interior
Rep. gr.
72
Rear seat; Removing and installing bench seat / individual seats
.
Fold carpet to the side or forwards.
Unclip cover
1
for flange at retaining tabs
arrows
, using
removal wedge
3409
.
Pull fuel supply line (black or black marking)
A
off fuel delivery unit. Separate plug-in connectors
Chapter
.
Connect
pressure tester
VAS 6551
with lines
VAS 6551/1
and
VAS 6551/2
to open ends of fuel supply line.
Switch on
pressure tester
VAS 6551
by pressing
On/Off
push button.
Open shut-off taps
“A”
and
“B”
of pressure tester and close shut-off tap
“C”
.
Start engine and run at idling speed.
Open shut-off valve
“B”
for a maximum of 15 seconds and, during this period, take pressure reading on
pressure tester
VAS 6551
. Specification at least 0.5 bar.
If the specifications are again not attained:
Checking fuel pump delivery rate
Chapter
Note
Ensure push-fit couplings are secured properly by pulling.