Checking fuel pressure regulator and residual pressure (engine code letters BGK) — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

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• Cut-off valve on K-Jetronic pressure testerV.A.G 1318 must be installed on the side leading to fuel rail.
• Open cut-off valve on pressure gauge. Lever must point in direction of flow.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ The fuel system is pressurised. Before loosening hose connections or opening the test connection (to measure fuel pressure), place a cloth around the connection. Then release pressure by carefully unscrewing the connection. — Briefly open the fuel tank filler cap (to release pressure).
2. Remove engine cover.
3. Cover pressurised union (fuel supply) with a cloth.
4. Open union (arrow) on fuel supply line and catch escaping fuel with a cloth.
5. Connect K-Jetronic pressure testerV.A.G 1318 with suitable adapters between fuel supply line and fuel rail. [Note: Cut-off valve on K-Jetronic pressure testerV.A.G 1318 must be installed on the side leading to fuel rail.]

6. Open cut-off valve on pressure gauge. Lever must point in direction of flow.
7. Start the engine and run at idling speed.
8. Measure the fuel pressure.
9. Switch off ignition.
10. Check leak-tightness and residual pressure by watching the drop in pressure on the pressure gauge.
11. Start the engine and run at idling speed.
12. Allow pressure to build up, then switch off ignition. At the same time, close cut-off valve of K-Jetronic pressure testerV.A.G 1318 (so that lever is perpendicular to direction of flow (arrow)).
13. Observe pressure drop on pressure gauge.

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