Volkswagen Golf Service & Repair Manual: Checking fuel 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. |
| – |
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-. |
| – |
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: |
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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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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-. |
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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. |
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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-
...
Special tools and workshop equipment required
Removal wedge -3409-
Pressure tester -VAS 6550-
Connector cable -VAS 6550/3-3-
...
Other materials:
ACC — Adaptive Cruise Control
Note
On vehicles with ACC, the trim in the right-hand
cover of the front bumper must not be painted during a
repair paint job or replacement. The ACC system located
behind can become operational due to the thickness ...
Stowage
Fig. 216 In the luggage compartment: variable
luggage compartment floor folded up
First read and observe the introductory information
and safety warningsThe vehicle toolkit, spare wheel, temporary spare wheel
or breakdown set may be located in various places in the vehicle, e.g. in the side ...
Checking fuel system for leaks
Special tools and workshop equipment
required
Fuel system tester (so-called smoke tester) -KLI 9210-
Adapter hose -KLI 9210/55-1-
Hose clamps up ...
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Checking function and voltage supply of the fuel pump, engine code CWVA
Checking fuel pressure, engine code CWVA