Removing and installing high-pressure accumulator (rail) — AUDI

🔧 Engine codes this applies to

📐 25 workshop diagrams for CDBA

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

📋 Procedure

1. Disconnect connector (1) from fuel pressure sender G247(2).
2. Unscrew bolt (1) for retainer (2).
3. ⚠ Carefully pull fuel return lines upwards when disconnecting as the 4 catches (arrow) can fracture.After disconnecting, check the 4 catches (arrow) to see whether they are fractured or have broken off.Always replace damaged fuel return lines.A damaged fuel return line that becomes loose when engine is running causes damage to piezo injectors. The piezo injector must then be replaced.The engine must not be run when the fuel return line is disconnected, this is because the coupling chamber will be emptied due to the lack of the counterpressure. — With engine switched off, carefully pull return line connections off at piezo injectors. To do this, press the two clips downwards (arrow A) and, at the same time, pull the release bolt upwards (arrow B).
4. Pull all fuel return lines (1) off piezo injectors.
5. Release connectors (2) and pull them off piezo injectors.

6. Unscrew union nuts (1) from piezo injectors.
7. Ensure cleanliness. No dirt must be allowed to get into the disconnected fuel return lines or the open connections on the piezo injectors.
8. Unscrew bolts (2) from high-pressure accumulator (fuel rail).
9. Pull cable guide (3) from high-pressure accumulator (fuel rail).
10. Unclip connector (2) and pull off from fuel pressure regulating valve N276(1).
11. Pull fuel hose (3) from high-pressure accumulator (fuel ail) (4).
12. Remove high-pressure accumulator (fuel rail) (1). Guide high-pressure accumulator (fuel rail) past fuel return line and fuel lines.
13. Ensure cleanliness. No dirt may get into the injector holes on the cylinder head cover.
14. ⚠ For vehicles with solenoids, the learnt values from the fuel system must be reset following the renewal of the fuel pressure regulating valve N276. — Install high-pressure lines (without tension).
15. Observe instructions for installing high-pressure lines .
16. The fuel system must first be filled with fuel before the engine is started .

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