Audi TT Fuel Pump Symptoms Point to Costly Repair

Had similar issues with an Audi A5 2011 gasoline engine. The symptoms matched exactly, rough idling, stalling, and increased fuel consumption. Initial diagnosis pointed to fuel system problems. The root cause turned out to be corroded electrical connections at the fuel pump assembly. The car mechanics found that moisture had damaged the wiring harness, disrupting proper pump function and gasoline delivery. This created inconsistent fuel pressure, explaining the engine stalling and rough running. This is a serious issue requiring prompt attention, as continuous operation can damage other fuel system components. The repair involves accessing the fuel pump assembly through the rear seat area, replacing the wiring harness, and ensuring proper connections. Key warning signs indicating pump failure: Sputtering at high speeds, Drop in power during acceleration, Check engine light triggered by fuel pressure sensors, Whining noise from the rear of the car Would suggest having a full fuel system diagnostic performed. The error codes your car mechanics found likely relate to fuel pressure irregularities. Getting this fixed early prevents more extensive damage.

Thank you for sharing this experience. Your fuel pump diagnosis mirrors the issues I faced last year. After seeing your detailed explanation, I am even more convinced my automotive diagnosis was correct. The car performance problems and engine stalling symptoms were nearly identical. Did you track how much the complete repair ended up costing? I am particularly interested in whether they had to replace just the wiring or the entire fuel pump assembly. Also, have you experienced any fuel injector issues or similar problems since the repair was done?

Thanks for asking about the follow-up. Since fixing the fuel pump electrical connection issue, my Audi A5 has been running perfectly with no car performance problems. The repair was straightforward, the car mechanics only needed to replace the damaged wiring harness and connector plug rather than the entire pump assembly. The total repair cost came to 95 Euro, which included labor and parts. This was much cheaper than replacing the complete fuel pump unit. No engine stalling or fuel injector problems have occurred in the months since the fix. The key was catching it early before the faulty connection could cause more extensive fuel system damage. The repair resolved all the original symptoms, the rough idling disappeared, fuel consumption returned to normal, and the check engine light cleared up. Looking back, it was definitely worth addressing the pump failure symptoms quickly. Regular fuel system maintenance since then has kept everything running smoothly.

Thanks for your helpful response about the fuel pump repair costs. I finally got my TT fixed last week and wanted to share my experience for others facing similar issues. The auto repair took 3 hours total. My car mechanics found the fuel pump assembly needed full replacement due to internal corrosion. Parts and labor came to 450 Euro, which was actually less than I feared after researching typical costs. Since the repair, the engine stalling and rough idling problems have completely disappeared. Fuel consumption is back to normal and the check engine light has stayed off. The shop also checked the fuel injectors while they were in there, all tested fine with no additional issues. My advice to others: If you notice these symptoms, get it checked promptly. Quick action on fuel system problems prevents more expensive repairs down the road. The final cost was worth it for the improved performance and peace of mind.