Checking non-return valve for fuel pump — VW
Checking non-return valve for fuel pump on VW: 19 steps, engines ACK, ADR, AEB, AEK. 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.
🧭 Before you start
Fits: platform codes 1C1, 1Y7
- Special tools named: V.A.G 1318, V.A.G 1318/17
- Renewed: fuel delivery unit
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- Suction-jet pump support must be connected.
- Cover flange opening (risk of splashes).
- Danger of spray when opening the shut-off tap. Hold container in front of free connection of the pressure gauge. — If pressure builds up too high, relieve excess pressure by carefully opening shut-off tap.
🔧 Engine codes this applies to
📐 28 workshop diagrams for ACK
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Fold rear seat bench forwards.
- Remove cover from fuel delivery unit.
- Pull off 4-pin connector (1).
- Connect remote control for V.A.G 1348V.A.G 1348/3A using an adapter cable to contact (1) on fuel pump and to battery positive (+) (illustration shows plastic fuel tank).
- Connect contacts (4) of connector and fuel pump using an auxiliary cable from auxiliary measuring setV.A.G 1594 C.
- Pull off supply line (1) from fuel filter inlet , Removing and installing fuel delivery unit.
- Connect pressure tester V.A.G 1318 with adapter V.A.G 1318/17 as shown.
- Push adapterV.A.G 1318/1 onto adapterV.A.G 1318/11 of pressure tester and hold it in measuring container.
- Suction-jet pump support must be connected.
- Insert fuel delivery unit.
- Restore current supply to fuel pump.
- Replenish again some fuel.
- Cover flange opening (risk of splashes).
- Close shut-off tap of pressure tester (lever perpendicular to direction of flow, position (B)).
- Operate remote control at short intervals until a pressure of approx. 4 bar has built up.
- ⚠ Danger of spray when opening the shut-off tap. Hold container in front of free connection of the pressure gauge. — If pressure builds up too high, relieve excess pressure by carefully opening shut-off tap.
- Observe pressure drop on pressure gauge.
- Check line connections for leaks.
- Fuel pump defective, renew fuel delivery unit .
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Ask about your VW ACK — free → or sign up free to see the drawingsOther VW procedures
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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
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.