Volkswagen Golf Service & Repair Manual: Checking holding pressure
| Special tools and workshop equipment required |
| Pressure tester -VAS 6550- |
| Connector cable -VAS 6550/3-3- |
| Connector cable -VAS 6550/3-4- |
| Vehicle diagnostic tester |
| Voltage supply OK
→ Chapter. |
| – |
Observe safety precautions
→ Chapter. |
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Observe rules for cleanliness
→ Chapter. |
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Pull off supply line -1-.
Separate plug-in connectors
→ Chapter. |
The fuel system is pressurised.Risk of injury due to fuel which may
spurt out.Wear eye protection.Wear protective gloves.Release pressure:
place clean cloth around connection and carefully open connection.
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Collect escaping fuel with a cleaning cloth. |
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Connect hose -VAS 6550/1- to connection
-A- of pressure tester -VAS 6550-. |
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Connect hose -VAS 6550/1- to fuel supply line
-1- leading to engine. |
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Connect hose -VAS 6550/2- to connection
-B- of pressure tester -VAS 6550-. |
| – |
Use hose -VAS 6550/2- to connect fuel line leading to fuel
tank with pressure tester -VAS 6550-. |
| – |
Ensure plug-in connectors are secured properly by pulling. |
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Ensure that drain tap -C- on
pressure tester-1- is closed. |
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Shut-off valves -A- and
-B- on pressure tester-1-
are open. |
| – |
Connect vehicle diagnostic tester. |
| – |
Select final control diagnosis for fuel pump in vehicle
self-diagnosis program. |
 Note
| The fuel pump is now actuated to build up fuel pressure. |
| If the final control diagnosis is to be carried out several
times in succession, it may be necessary to start the engine
briefly before repeating the final control diagnosis. |
| – |
Read off fuel pressure on pressure gauge. |
| Specification: 4.0…7.0 bar. |
| If fuel pressure is OK, check holding pressure
→ Chapter. |
| If the specification is exceeded: |
| – |
Pressure limiting valve in fuel delivery unit is defective. |
| – |
Renew fuel delivery unit
→ Chapter. |
| If the specification is not attained: |
| Proceed as follows to check fuel pressure at fuel delivery
unit: |
| – |
Remove right rear seat
→ General body repairs, interior; Rep. gr.72. |
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Partially detach cover -1- in
floor covering at parting line -arrow-. |
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Do not detach cover completely from floor covering in order
to ensure it is reinstalled in the correct installation
position. |
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Detach it just enough that the cover can be folded upwards. |
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Fold up cover in -direction of arrow-. |
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Remove rear bench seat
→ General body repairs, interior; Rep. gr.72. |
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| Continuation for all vehicles: |
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Unclip cover -1- for flange at
retaining tabs -arrows-, using
removal wedge -3409-. |
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Unclip sealing grommet -1-
downwards from cover -2-. |
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Push cover -2- back along
wiring harness -3-. |
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Press up tab -2- in
-direction of arrow A-; to do so,
reach between floor panel and fuel tank with your finger. |
| – |
At the same time, carefully pull fuel pump control unit-1-
out of mounting -in direction of arrow B-
by grasping hold of wiring harness -3-. |
| – |
Guide fuel pump control unit -J538- out towards interior
between fuel tank and floor panel. |
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Place fuel pump control unit -J538- (with connector still
connected) to one side. |
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Pull fuel line -1- off flange.
Separate plug-in connectors
→ Chapter. |
The fuel system is pressurised.Risk of injury due to fuel which may
spurt out.Wear eye protection.Wear protective gloves.Release pressure:
place clean cloth around connection and carefully open connection. |
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| – |
Connect pressure tester -VAS 6550- with hose -VAS 6550/3-4-
to fuel delivery unit -1-. |
| – |
Connect pressure tester -VAS 6550- and fuel supply line
-2- by means of hose -VAS
6550/3-3-. |
| – |
Ensure plug-in connectors are secured properly by pulling. |
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Ensure that drain tap -C- on
pressure tester-1- is closed. |
| – |
Shut-off valves -A- and
-B- on pressure tester-1-
are open. |
| – |
Repeat final control diagnosis to build up fuel pressure. |
| If specification is attained: |
| – |
Check fuel lines for possible restrictions (kinks) or
blockages. |
| – |
Check fuel line for leaks and damage. |
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| If the specification is not attained: |
| – |
Remove fuel delivery unit
→ Chapter and check for contamination. |
| – |
Check that all hoses are connected
-arrows-. |
| – |
Check fuel lines for possible restrictions (kinks) or
blockages. |
| – |
Check fuel lines for leaks and damage. |
| – |
Fuel pump is defective, renew fuel delivery unit
→ Chapter. |
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Special tools and workshop equipment required
Removal wedge -3409-
Pressure tester -VAS 6550-
Connector cable -VAS 6550/3-3-
...
Special tools and workshop equipment required
Removal wedge -3409-
Pressure tester -VAS 6550-
Connector cable -VAS 6550/3-3-
...
Other materials:
Hydraulic system
General notes on brake fluid
Only use new brake fluid conforming to VW standard
(VW 501 14).
Note
Brake fluid is poisonous. Also due to its corrosive effect
brake fluid must not come into c ...
Classification of extraction and charging devices in groups
Group 3:
Portable extraction and charging devices linking the air
conditioning system to a fixed compressed gas container.
The fixed compressed gas container is charged with
refrigerant or refrigerant/oil mixture. The po ...
Removing and installing seat heating element -Z6-/-Z8-
Removing
If the seat padding in a vehicle with seat heating is
renewed, then the respective seat heating element must also be
renewed.
–
Separate seat cover from seat ...
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Checking fuel pressure, engine code CWVA
Checking holding pressure, engine code CWVA