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. |
| – |
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.
| – |
Collect escaping fuel with a cleaning cloth. |
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| – |
Connect hose -VAS 6550/1- to connection
-A- of pressure tester -VAS 6550-. |
| – |
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-. |
| – |
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. |
| – |
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-. |
| – |
Do not detach cover completely from floor covering in order
to ensure it is reinstalled in the correct installation
position. |
| – |
Detach it just enough that the cover can be folded upwards. |
| – |
Fold up cover in -direction of arrow-. |
| – |
Remove rear bench seat
→ General body repairs, interior; Rep. gr.72. |
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| Continuation for all vehicles: |
| – |
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-. |
| – |
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. |
| – |
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-
...
Special tools and workshop equipment required
Removal wedge -3409-
Pressure tester -VAS 6550-
Connector cable -VAS 6550/3-3-
...
Other materials:
Expansion valve
The expansion valve atomises incoming refrigerant and
regulates the flow so that, depending on the heat transport, the
vapour does not become a gas until it reaches the outlet of the
evaporator.
...
Introduction
This chapter contains information on the following subjects:
→ Vehicle key
→ Indicator lamp in the vehicle key
→ Replacing the battery
→ Synchronising the vehicle key
Additional information and warnings:
Settings in the Volkswagen informatio ...
Assembly overview - headlight washer system
1 -
Headlight washer system pump -V11-
Removing and installing
→ Chapter
2 -
Sealing grommet
Renew if damaged.
3 -
Washer fluid reservoir
Removing and in ...
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Checking function and voltage supply of the fuel pump, engine code CWVA
Checking fuel pressure, engine code CWVA