TorqFix

Checking non-return valve of right pump: VW Touareg I (AXQ, AYT, BHX, BJN, …)

Step-by-step checking non-return valve of right pump for the VW Touareg I: 12 steps. What to remove, in what order, and what to check after.

Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.

12 steps 6 engine codes engine codes merged from 3 documented variants

🧭 Before you start

Fits: VW Touareg I (7L, 2002–2010)

  • Special tools named: V.A.G 1348/3
  • Renewed: right fuel delivery unit

Don't miss

  • Ensure that fuel supply line connection engages audibly when joined.
  • Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar.

🔧 Engine codes this applies to

AXQAYTBHXBJNBKLBRK

📋 Procedure

  1. Now unscrew locking ring from flange (fuel filter) using wrench T10202.
  2. Carefully lever flange and raise it slightly.
  3. Disconnect connectors next to fuel filter.
  4. Then detach fuel supply hose (2) leading from right fuel delivery unit from fuel filter (1).
  5. Allow fuel from connection (1) to flow back into fuel tank.
AXQ? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Close pressure gauge shut-off tap (lever at right angles to direction of flow).
  2. Connect pressure testerV.A.G 1318 with adapterV.A.G 1318/7, adapterV.A.G 1318/13 and adapterV.A.G 1318/17 as shown. [Note: Ensure that fuel supply line connection engages audibly when joined.]
  3. Now connect remote controlV.A.G 1348/3A with adapter V.A.G 1348/3-3 to connection (arrow) of fuel pump relay for right fuel delivery unit.
  4. Operate remote control at short intervals until a pressure of approx. 4 bar has built up.
  5. Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar.
  6. Right fuel pump is defective. Renew right fuel delivery unit .
  7. Open lever of pressure tester and let fuel flow back to fuel tank through hoseV.A.G 1318/13.

Other VW procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.