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Volkswagen Golf / Golf GTI / Golf Variant. Manual - part 756

– 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 -

VAS6550- -1- are opened.

– Connect the Vehicle Diagnostic Tester .
– Select the fuel pump output diagnostic test mode in OBD.

Note

♦

The fuel pump is now activated to build up the fuel pressure.

♦

If the output diagnostic test mode is performed several times

in succession, it may be necessary to briefly start the motor

before repeating the output diagnostic test mode.

– Read the fuel pressure on the pressure gauge.
• Specified value: 4.0 to 7.0 bar.
If the fuel pressure is OK, check the residual pressure. Refer to

⇒ “8.1.5 Residual Pressure, Checking”, page 95

If the specified value is exceeded:
– The pressure relief 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

Installing”, page 52

If the specified value is not obtained:
Proceed as follows to check the fuel pressure at the fuel delivery

unit:
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.

– Remove the fuel lines -1- from the flange. Disconnect the con‐

nector 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 supply 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- on the -VAS6550- -1- are

opened.

– Repeat the output diagnostic test mode to build up the fuel

pressure again.

If the specified value is obtained:
– Check the fuel lines for possible restrictions (kinks) or block‐

ages.

– Check the fuel line for leaks and damage.

If the specified value is not obtained:
– Remove the fuel delivery unit (refer to

⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and

Installing”, page 52

) and inspect it for debris.

– Make sure all hoses -arrows- are connected.
– Check the fuel lines for possible restrictions (kinks) or block‐

ages.

– Check the fuel lines for leaks and damage.
If no error can be found:
– If the fuel pump is faulty, replace the fuel delivery unit. Refer

⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and

Installing”, page 52

8.1.4

Fuel 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