Checking for internal leaks: VW Touareg I (AJM, AMF, ANU, ARL, …)

🧭 Before you start

Fits: VW Touareg I (7L, 2002–2010)

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• Pull fuel supply hose (white marking) and fuel return hose (blue marking) off tandem pump.
• To turn the pressure regulating valve (2) the knob must be pulled upwards.
• If there is water in the sight glass, drain at water drain screw (6).
• The maximum test pressure is 1.3 bar and this must not be exceeded. — Open valve (4) and wait until the test circuit is filled. If necessary readjust pressure to 1.0 bar.

🔧 Engine codes this applies to

📋 Procedure

1. Pull fuel supply hose (white marking) and fuel return hose (blue marking) off tandem pump.
2. Seal fuel return union on tandem pump with a plug. Secure sealing plug with a spring-type clip.
3. Turn pressure regulating valve (2) anti-clockwise onto stop.
4. Close valves (3) and (4).
5. Connect test connection (5) to fuel supply union of tandem pump using a commercially available compressed air connection and a section of fuel hose. Use a spring-type clip to secure. [Note: To turn the pressure regulating valve (2) the knob must be pulled upwards.]

6. Connect compressed air hose (1) (compressed air source) to charge air system testerV.A.G 1687. [Note: If there is water in the sight glass, drain at water drain screw (6).]
7. Open valve (3).
8. Adjust pressure to 1.0 bar with pressure regulating valve (2).
9. ⚠ The maximum test pressure is 1.3 bar and this must not be exceeded. — Open valve (4) and wait until the test circuit is filled. If necessary readjust pressure to 1.0 bar.
10. Close valve (3) to retain pressure and observe the pressure drop over a period of 1 minute.

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