Checking delivery rate, vehicles with engine codes CWVA, CWVB, CHYA, CHYB — VW

🧭 Before you start

Connect a battery charger, fold up the bench seat, remove the cover and fit the 5-pin adapter, remote control and multimeter. Connect the pressure tester and regulating valve to the supply line from the tank, set 4.0 bar, empty the container and run the pump for 60 seconds while noting voltage. If delivery is short, repeat with the filler cap removed to test the tank breather, then before the filter and at the delivery unit outlet, checking lines for kinks and leaks. Finally inspect the filter strainer and connections or renew the delivery unit.

Fits: VW Polo 6C (2014–2017); platform code 614

• Special tools named: VAS 5565
• Renewed: if necessary, fuel delivery unit

Don't miss

• Delivery depends on battery voltage, so keep a charger connected and log pump voltage during the test.
• Set 4.0 bar on the regulating valve and do not move the adjuster afterwards.
• The fuel line is under pressure; wrap a cloth around the joint before opening.
• If delivery recovers with the filler cap off, check the tank breather.
• Check lines for kinks and leaks at each stage before blaming the pump.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 36 workshop diagrams for CHYA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. Connect battery charger Electrical system27Battery; Charging battery.
4. Fold up bench seat General body repairs, interior72Rear seats; Removing and installing bench seat/individual seats.
5. Unclip cover (1) at retaining tabs (arrows) using removal wedge3409.

6. Release and pull off connector (1).
7. Connect test instrument/DSO adapter (5-pin)VAS 5565 to connector and fuel delivery unit.
8. Connect remote controlV.A.G 1348/3A to adapterVAS 5565 and to battery positive terminal in engine compartment. [Note: This step serves only to have the fuel pump running when the engine is stopped.]
9. The quantity of fuel delivered by the fuel pump is dependant on the battery voltage. The multimeter must therefore be connected to contacts (1) and (5) of 5-pin test instrument/DSO adapterVAS 5565 as well.
10. Connect multimeter with auxiliary measuring setV.A.G 1594C.
11. Release supply line (1) and pull it off. Separate plug-in connectors .
12. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Collect escaping fuel with a cleaning cloth.
13. Using hoseVAS 6550/2, connect pressure testerVAS 6550 to fuel supply line coming from fuel tank.
14. Connect pressure regulating valveVAS 6550/4 to connection (B) of pressure testerVAS 6550.
15. Hold end of hose of pressure regulating valveVAS 6550/4 in measuring container.
16. Ensure that drain tap (C) on pressure testerVAS 6550(1) is closed.
17. Shut-off taps (A) and (B) on pressure testerVAS 6550(1) must be open.
18. ⚠ Danger of spraying! Wear eye protection and protective clothing to avoid eye injuries and skin contact. Hold container in front of the free connection on the pressure testerVAS 6550. — Press remote controlV.A.G 1348/3A. [Note: The fuel system pressurisation pump G6 will be actuated.]
19. Read pressure shown by pressure testerVAS 6550.
20. Adjust pressure on pressure regulating valveVAS 6550/4 to 4.0 bar.
21. Set pressure on pressure regulating valveVAS 6550/4 using adjuster wheel (arrow).
22. Keep the adjuster in this position from this point on.
23. Drain measuring container.
24. Press remote control for 60 seconds whilst measuring voltage at fuel pump.
25. Open tank flap unit.
26. Clean area around fuel filler neck.
27. Unscrew cap from fuel filler neck (arrow).
28. Repeat check .
29. Check fuel tank breather .
30. Check fuel lines for possible restrictions (kinks) or blockages.
31. Check fuel lines for leaks and damage.
32. Pull fuel supply line (arrow) off fuel filter. Separate plug-in connectors .
33. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/1.
34. Connect pressure regulating valveVAS 6550/4 to connection (A) of pressure testerVAS 6550.
35. Hold end of hose of pressure regulating valveVAS 6550/4 in measuring container.
36. Ensure that drain tap (C) on pressure testerVAS 6550(1) is closed.
37. Shut-off taps (A) and (B) on pressure testerVAS 6550(1) must be open.
38. Repeat fuel delivery rate check .
39. Check fuel lines for possible restrictions (kinks) or blockages.
40. Check fuel lines for leaks and damage.
41. Check fuel filter, renew if necessary .
42. Pull off fuel supply line (3) (black). Separate plug-in connectors .
43. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Connect pressure testerVAS 6550 with hoseVAS 6550/2 to fuel delivery unit (1).
44. Connect hoseVAS 6550/2 to shut-off tap (A).
45. Connect pressure regulating valveVAS 6550/4 to connection (B) of pressure testerVAS 6550
46. Hold end of hose of pressure regulating valveVAS 6550/4 in measuring container.
47. Ensure that drain tap (C) on pressure testerVAS 6550(1) is closed.
48. Shut-off taps (A) and (B) on pressure testerVAS 6550(1) must be open.
49. Repeat fuel delivery rate check .
50. Check fuel lines for possible restrictions (kinks) or blockages.
51. Check fuel lines for leaks and damage.
52. Remove fuel delivery unit .
53. Check filter strainer for soiling.
54. Check that all fuel delivery unit (1) hose connections (arrows) are connected.
55. Check fuel lines for possible restrictions (kinks) or blockages.
56. Check fuel lines for leaks and damage.
57. Renew fuel delivery unit .

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