Checking delivery pressure of fuel system pressurisation pump G6 - vehicles with 0.5 bar low pressure fuel system — VW

Checking delivery pressure of
fuel system pressurisation pump
G6
- vehicles with 0.5 bar low pressure fuel system
Special tools and workshop equipment required
Vehicle diagnosis, testing and information system
VAS 5051B
Pressure gauge
VAS 6550
Test prerequisite:
Room temperature or fuel temperature 10 °C to 25 °C.
Fuses must be OK.
Battery voltage at least 12 V.
All electrical consumers, e.g. lights and rear window heating, must be switched off.
Test sequence
Separate quick-release fastener
2
(black or with black marking) of fuel supply line
Chapter
“
Separating plug-in connectors
”
.
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
On/Off
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 period of 15 seconds. Take pressure reading on
pressure tester
VAS 6550
during this period. Specification should be at least 0.5 bar.
If the delivery pressure temporarily drops, renew fuel delivery unit.
If specification is attained:
In the event of engine running problems, renew fuel filter
Anchor
to eliminate potential fuel filter blockage problem.
If the specification is not attained:
Separate fuel supply lines
1
on front right of fuel tank
Chapter
“
Separating plug-in connectors
”
.
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
On/Off
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 period of 15 seconds. Take pressure reading on
pressure tester
VAS 6550
during this period. Specification should be at least 0.5 bar.
If the specifications are again not attained:
Checking fuel pump delivery rate
Chapter
Note
After assembling, check all quick-release couplings are fully engaged by pulling on them.