Checking fuel pressure, engine codes BLR, BLX, BLY, BVY, BVZ — VW

🧭 Before you start

Fits: VW Touran I (1T, 2003–2015)

• Renewed: fuel filter, fuel delivery unit

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Fuel supply line is pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Remove supply line (2) and collect escaping fuel with a cloth.
2. Install pressure testerV.A.G 1318 using adapter setV.A.G 1318/17A as shown.
3. Open shut-off valve of pressure gauge.
4. Switch on ignition repeatedly until fuel pressure does not rise any more on pressure gauge.
5. Read fuel pressure on pressure gauge. Specification: 3.5…5.0 bar.

6. Check return line between fuel filter and fuel pump for kinks and blockages.
7. Pressure limit valve in fuel filter is defective. Renew fuel filter.
8. Check fuel pressure before fuel filter. Connect pressure testerV.A.G 1318 and adapter setV.A.G 1318/17A between fuel filter and fuel supply pipe.
9. Open the pressure tester shut-off tap. The handle points in direction of flow.
10. Start engine and run at idling speed.
11. ⚠ Close shut-off tap very slowly. If fuel pressure is 8 bar, re-open shut-off tap immediately to avoid damaging pressure tester. — Close shut-off tap of pressure tester slowly. Pressure must rise to min. 6.0 bar. When 6 bar is reached, open shut-off tap again immediately.
12. Fuel pump is OK. Pressure limiting valve in fuel filter is defective. Renew fuel filter.
13. Fuel pump defective, renew fuel delivery unit .

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