Volkswagen Golf Service & Repair Manual: Checking fuel pressure, engine code CWVA
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. |
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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-. |
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Use hose -VAS 6550/2- to connect fuel line leading to fuel
tank with pressure tester -VAS 6550-. |
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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. |
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Connect vehicle diagnostic tester. |
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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. |
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Read off fuel pressure on pressure gauge. |
Specification: Approx. 4.0 bar. |
If fuel pressure is OK, check holding pressure
→ Chapter. |
If the specification is exceeded: |
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Pressure limiting valve in fuel delivery unit is defective. |
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Renew fuel delivery unit
→ Chapter. |
If the specification is not attained: |
Proceed as follows to check fuel pressure at fuel delivery
unit: |
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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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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-. |
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Connect pressure tester -VAS 6550- and fuel supply line
-2- by means of hose -VAS
6550/3-3-. |
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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. |
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Repeat final control diagnosis to build up fuel pressure. |
If specification is attained: |
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Check fuel lines for possible restrictions (kinks) or
blockages. |
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Check fuel line for leaks and damage. |
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If the specification is not attained: |
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Remove fuel delivery unit
→ Chapter and check for contamination. |
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Check that all hoses are connected
-arrows-. |
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Check fuel lines for possible restrictions (kinks) or
blockages. |
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Check fuel lines for leaks and damage. |
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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-
...
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