Checking fuel pressure and residual pressure (up to high-pressure pump) — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

• Special tools named: V.A.G 1348, V.A.G 1348/3

Don't miss

• Disregard (item 2).
• Do not stretch or kink line.
• Connect contact (1) to battery positive via an improvised test lead. For safety reasons an in-line fuse (A) (10 A) must be connected into the lead.
• Before removing pressure gauge, release fuel pressure by opening cut-off valve. Hold a container under the connection.
• Re-connect fuel supply line to connecting piece (make sure that all parts are clean and that there are no leaks).

🔧 Engine codes this applies to

📐 28 workshop diagrams for AUK

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

📋 Procedure

1. If necessary, fold forward backrests of rear seat bench.
2. Take out luggage compartment floor trim.
3. Remove luggage compartment floor (1). [Note: Disregard (item 2).]
4. On vehicles without air suspension: unclip the retaining tabs (arrows) for the flange cover.
5. On vehicles with air suspension: remove spreader pins (arrows) and take off cover (1).

6. On vehicles with air suspension: unscrew bolts (arrows).
7. Detach accumulator (2) and lay it aside with line (1) connected. [Note: Do not stretch or kink line.]
8. Release retaining lugs (arrows).
9. Fold retaining lugs (1) and (3) open to rear.
10. Fold cover (2) to front (arrow).
11. Unscrew cover for flange (arrows).
12. Unplug electrical connector (arrow) at flange.
13. Connect remote controlV.A.G 1348/3A for V.A.G 1348 to contact (5) using adapter cable V.A.G 1348/3-3 and test lead from auxiliary measuring setV.A.G 1594C.
14. Tape off 2nd connector contact of adapter cable V.A.G 1348/3-3 with insulating tape (arrow) to prevent short circuits.
15. Move switch of remote controlV.A.G 1348/3A for V.A.G 1348 to front of engine compartment.
16. Connect crocodile clip to earth point in engine compartment.
17. Connect contact (1) to battery positive via an improvised test lead. For safety reasons an in-line fuse (A) (10 A) must be connected into the lead.
18. Remove filler cap from fuel filler neck.
19. Pull off engine cover panel (rear).
20. ⚠ The pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening the system .A clean cloth must then be wrapped around the connection and the residual pressure dissipated by carefully loosening the connection. — Connect K-Jetronic pressure testerV.A.G 1318 with adapter from adapter setV.A.G 1318/10-12 to fuel line.
21. Fit test hose (arrow) onto pressure tester and hold end of hose into a container to catch escaping fuel.
22. Open cut-off valve on pressure tester.
23. Bleed fuel system by pressing remote control switch briefly.
24. Close cut-off valve on pressure gauge.
25. Press switch on remote control until pressure gauge shows no further increase in pressure.
26. Check fuel delivery rate of fuel pump 20.
27. Check for leaks and check residual pressure by watching drop in pressure on pressure tester.
28. Switch off ignition. [Note: Before removing pressure gauge, release fuel pressure by opening cut-off valve. Hold a container under the connection.]
29. Re-connect fuel supply line to connecting piece (make sure that all parts are clean and that there are no leaks).

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