Removing and installing high-pressure pumps, high-pressure pumps with fuel supply line — AUDI

🧭 Before you start

Fits: platform code 42

• Renewed: o-ring

Don't miss

• Do not attempt to bend high-pressure pipes to a different shape.
• Always renew O-ring.
• Lubricate thread of union nut with clean engine oil.The connections of the high-pressure pipes must not be damaged.Do not attempt to bend high-pressure pipes to a different shape.
• Ensure that fuel lines are not under tension.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ The fuel system operates under high pressure. 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. — R8 Coupé: Remove engine compartment trim panel on relevant side 53.
2. R8 Spyder: Remove engine compartment trim panel (1)53.
3. Unplug electrical connector (3) for fuel metering valve N290.
4. Loosen union nuts for high-pressure pipe (1) and fuel supply line (2).
5. Remove bolts (arrows) for high-pressure pump. [Note: Do not attempt to bend high-pressure pipes to a different shape.]

6. Carefully pull out high-pressure pump.
7. Pull roller tappet out of cylinder head.
8. Unplug electrical connector (1) at fuel metering valve 2N402.
9. Loosen union nuts for high-pressure pipe (2) and fuel supply line (3).
10. Remove bolts (arrows) for high-pressure pump. [Note: Do not attempt to bend high-pressure pipes to a different shape.]
11. Carefully pull out high-pressure pump.
12. Pull roller tappet out of cylinder head. [Note: Always renew O-ring.]
13. Fit roller tappet in cylinder head.
14. Only lift fuel lines slightly to fit high-pressure pump.
15. Fit high-pressure pump in cylinder head and secure in position. [Note: Lubricate thread of union nut with clean engine oil.The connections of the high-pressure pipes must not be damaged.Do not attempt to bend high-pressure pipes to a different shape.]
16. Tighten union nut on high-pressure pipe hand-tight initially.
17. Ensure that fuel lines are not under tension.
18. To tighten union nuts, use torque wrenchV.A.G 1331 with appropriate tool insert.
19. Check for leaks .

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