Intake manifold (bottom section) with fuel rail - exploded view — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

• Special tools named: V.A.G 1331/2

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• Ensure that high-pressure pipe is not under tension.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ The fuel system operates at extremely high pressure. This can cause injury.The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. — Tighten union nut on high-pressure pipe hand-tight initially.
2. Ensure that high-pressure pipe is not under tension.
3. To tighten high-pressure pipe on fuel rail, use torque wrenchV.A.G 1331 with tool insert (open-end ring spanner, 17 mm) V.A.G 1331/2.
4. Tighten union nut for high-pressure pipe to 27 Nm. — 27 Nm (20 lb-ft)

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