Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 758
If no faults can be found:
– Make sure that the drain valve -C- on the Pressure Tester
-1- is closed.
– The shut-off valves -A and B- on the Pressure Tester Kit -1-
are opened.
– Activate the fuel pump using the output diagnostic test mode
to build the fuel pressure.
– Close the shut-off valve -A- on the pressure gauge immedi‐
ately after the pressure has been reached. The lever is per‐
pendicular to the flow direction.
If the Pressure Drops Again (Leak on fuel tank side):
Proceed as follows to check residual pressure on the fuel delivery
.
If the Pressure no Longer Decreases (Leak on the Engine Side):
Note
Check for the leak on the engine-side. Repeat the residual pres‐
sure check. Close the shut-off valve -B- this time to determine if
there actually is a leak on the engine side.
– If there is a leak on the engine-side, check the fuel pipes and
high pressure pump for leaks.
If no malfunction is found, check the fuel injectors for leaks:
– Remove the spark plugs.
– Open the shut-off valve -A- and -B-. Activate the fuel pump
with the output diagnostic test mode.
– Check through the spark plug hole if fuel is collecting on the
piston crown due to a leaking fuel injector.
Residual Pressure in Fuel Delivery Unit, Checking:
Golf Sportsvan:
– Remove the right rear seat. Refer to ⇒ Body Interior; Rep. Gr.
72 ; Rear Seats; Bench Seat / Single Seat, Removing and In‐
stalling .
– Partially loosen the cover -1- in the carpet at the separating
line -arrow-.
– Do not separate the cover completely from the carpet so that
later it will be installed correctly.
– Only loosen so far that the cover can be folded up.
– Fold up the cover in the direction of the -arrow-.
Golf and Golf Wagon:
– Remove the rear bench seat. Refer to ⇒ Body Interior; Rep.
Gr. 72 ; Rear Seats; Bench Seat / Single Seats, Removing
and Installing .
Continuation for All Vehicles:
– Unclip the sealing flange cover -1- at the tabs -arrows- using
the -3409- .
– Unclip the grommet -1- downward out of the cover -2-.
– Guide the cover -2- on the wiring harness -3- toward the rear.
– Lift the tab -2- in the direction of the -arrow A- by using a finger
to reach between the floor panel and the fuel tank.
– At the same time, pull the Fuel Pump Control Module -1- on
the wiring harness -3- in the -direction of the arrow B- carefully
out of the mount.
– Remove the Fuel Pump Control Module - J538- toward the
inside between the fuel tank and the floor panel.
– Move the Fuel Pump Control Module - J538- to the side with
the connector connected.
– Pull the fuel line -1- off the flange. Disconnect the connector
couplings. Refer to
⇒ “4.1 Connector Couplings, Disconnecting”, page 62
.
WARNING
The fuel line is under pressure.
Fuel poses a risk of injury to the eyes and skin.
Wear protective eyewear and protective clothing to avoid injury
and contact with skin. Place a cleaning cloth around the con‐
nection point before loosening hose connections. Carefully
open the connection point to release the pressure.
– Connect the -VAS6550- to the fuel delivery unit -1- using the
-VAS6550/3-4- .
– Connect the -VAS6550/3-3- between the -VAS6550- and the
fuel line -2-.
– Pull on the connector couplings to check them for secure fit.
– Make sure that the drain valve -C- on the Pressure Tester
-1- is closed.
– The shut-off valves -A and B- and -B- on the Pressure Tester
Kit -1- are opened.
– Activate the fuel pump using the output diagnostic test mode
to build the fuel pressure.
– Close the shut-off valve -B- on the pressure gauge immedi‐
ately after the pressure has been reached. The lever is per‐
pendicular to the flow direction.
– Repeat the residual pressure check. Refer to
.
If the Pressure no Longer Decreases:
– Check the fuel line for leaks.
If the Pressure Drops Again:
– Open the fuel delivery unit -1-. Refer to
⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and
.
– Make sure all hose connections -arrows- are connected.
– Check the fuel lines for leaks and damage.
If no Error Can Be Found:
– If the pressure retaining valve in the fuel delivery unit is faulty,
replace the fuel delivery unit. Refer to
⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and
.
8.1.6
Residual Pressure, Checking, Vehicles
with Engine Code CWVA
Special tools and workshop equipment required
♦ Trim Removal Wedge - 3409-
♦ Pressure Tester Kit - VAS6550-
♦ Pressure Tester Kit - Adapter Set - Hose 3 - VAS6550/3-3-
♦ Pressure Tester Kit - Adapter Set - Hose 4 - VAS6550/3-4-
♦ Vehicle Diagnostic Tester
– Pay attention to all safety precautions. Refer to
⇒ “1 Safety Precautions”, page 1
– Follow the guidelines for clean working conditions. Refer to
⇒ “3.1 Parking/Auxiliary Heater and Fuel System Clean Work‐
.
• Fuel pressure is OK and the Pressure Tester Kit - VAS6550-
is connected. Check the fuel pressure. Refer to
⇒ “8.1.3 Fuel Pressure, Checking”, page 87
.
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