VW Touran Fuel System Failure: Multiple Symptoms Found

I had very similar issues with my 2014 VW Golf with the 1.4 TSI engine. With some experience in basic car maintenance, I initially thought it was a major fuel pump failure, but the auto repair diagnosis revealed something simpler. The automotive diagnosis showed it was actually a loose wiring connection at the fuel pump connector. The symptoms matched exactly what you described, engine stalling, rough idle, and increased fuel consumption. The car mechanics found that moisture had caused corrosion in the connector, leading to intermittent electrical contact. The repair involved cleaning the connector, replacing damaged wires, and properly sealing the connection. Total cost was 95€ for the repair including labor. After fixing this, all the symptoms disappeared and the car performance returned to normal. Before jumping to conclusions about a complete fuel pump replacement, you might want to have the electrical connections checked first. Could you share: Which engine variant your Touran has? What error codes are stored? Does the problem get worse in wet weather? Have you noticed any correlation between the symptoms and weather conditions? This information would help determine if you might be facing the same connection issue or if its something else in the fuel system.

Latest service was at 135000km, currently at 140019km. Thanks for this detailed response. The error codes are P0171 and P0087 (System Too Lean and Fuel Rail System Too Low). The problem remains consistent regardless of weather. My engine is the 1.4 TSI with 150hp. I checked the connector at the fuel pump following your suggestion, but found it clean and properly seated. The problems persist and seem to be getting worse, especially the rough running and stalling. The fuel system issues are really starting to worry me, as I rely on this car daily. Would it be worth checking the fuel pressure directly before committing to a pump replacement? The auto repair shop quoted 750€ for a new pump but I want to be certain before proceeding.

Thanks for the additional details. Those specific error codes combined with consistent symptoms point more strongly toward an actual fuel pump issue in your case, unlike my connector problem. The 1.4 TSI engines are known for being sensitive to fuel pressure fluctuations. When my initial connection fix didnt solve similar issues on my Golf, further testing revealed the fuel pressure was indeed dropping under load. A fuel pressure test is definitely worth doing before replacing the pump, it usually costs around 50€ and provides conclusive evidence. Given your mileage and the error codes, especially P0087, the fuel pump is likely reaching the end of its service life. The progressive worsening of symptoms matches the typical pattern of pump failure I experienced. Car performance will continue to deteriorate until the pump is replaced. The 750€ quote sounds reasonable for a complete fuel pump assembly replacement, including labor. Make sure they also check the fuel injectors during the repair, as prolonged low pressure can sometimes affect injector performance. Based on the striking similarity to what happened with my Golf, considering we have the same engine, Id strongly recommend getting the pressure tested but also preparing for a pump replacement. After my pump was replaced, all the issues resolved completely and the car has run perfectly for 50000km since.

Thanks for sharing those pressure test details. After getting the fuel pressure tested today, the readings confirmed what we suspected. The pressure was well below spec, dropping from 3.5 bar to just 2.1 bar under load. Given all the evidence, the error codes, failed pressure test, and worsening symptoms, I think proceeding with the fuel pump replacement is the right call. The car performance issues are just too risky to ignore at this point. I went ahead and scheduled the repair for next week. The shop will do a full fuel system inspection including checking the fuel injectors while they have everything apart. The 750€ seems fair considering the parts and labor involved. Really appreciate your help in troubleshooting this. Having someone share their actual experience with similar fuel system issues on these TSI engines made me more confident in the diagnosis and repair decision. Will update once the work is done to confirm if it solved all the problems.

I need a little help! Where can I drain the fuel from a 2015 diesel VW Touran?

(Translated from Hungarian)

For safety reasons, it's best to have a professional mechanic handle fuel draining. However, if you need to drain the fuel yourself, locate the fuel tank drain plug underneath the vehicle. Ensure the car is securely lifted and supported before attempting this. Always use appropriate containers to catch the fuel and dispose of it according to local regulations. If you're unsure or uncomfortable with this process, I recommend consulting a professional to avoid any safety hazards. Let me know if you have any further questions!