Bleeding fuel system (vehicles up to chassis No. 4BZ 2N 109430 and allroad vehicles) — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Special tools named: V.A.G 1348, V.A.G 1390/1

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• Air bubbles may still be visible in the hose even after the bleeder container has been filled 3 times.
• Empty the bleeder container before it becomes full. No fluid must be allowed to enter the hand-operated vacuum pump. — Re-connect return hose to injection pump.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ When bleeding the fuel system, make sure the inner section of the baffle housing (capacity approx. 0.5 litres) is permanently filled with fuel.When the engine is not running (electric fuel pump off), the inner section of the baffle housing will only stay full if the tank is more than 1/3 full.So if the fuel tank is less than 1/3 full, follow the procedure outlined below. — Open fuse box lid on left-hand side of dash panel.
2. Pull out fuse No. 28 from fuse holder.
3. Connect remote controlV.A.G 1348/3A for V.A.G 1348 with adapter cableV.A.G 1348/3-2 to right-hand terminal of fuse socket No. 28 (arrow).
4. Connect crocodile clamp to vehicle battery (positive).
5. Keep remote control switch pressed while bleeding fuel system; fuel pump should run audibly.

6. Remove engine cover panel .
7. Using hose clamps up to Ø 25 mm3094, clamp off fuel return line at the following points:
8. Disconnect return hose for injectors of right cylinder bank at injection pump.
9. Connect a short length of hose (3) to the free hose connection on the injection pump.
10. Insert a suitable adapter (2) from accessories for V.A.G 1390/1 into the short length of hose.
11. Connect hose (1) between adapter and bleeder container V.A.G 1390/1.
12. Operate hand pump and fill bleeder container three times in this way. [Note: Air bubbles may still be visible in the hose even after the bleeder container has been filled 3 times.]
13. ⚠ Empty the bleeder container before it becomes full. No fluid must be allowed to enter the hand-operated vacuum pump. — Re-connect return hose to injection pump.
14. Remove hose clamps up to Ø 25 mm3094 from return hose.
15. Put back fuse No. 28 if it has been removed.
16. Start engine and inspect fuel system for leaks (visual check).

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