Q7 Fuel System Failure Symptoms & Expert Fix Needed

Having experienced nearly identical symptoms with my 2008 Audi A6 3.2 FSI, this strongly indicates a fuel pump failure. The engine stalling, poor performance, and increased fuel consumption mirror classic fuel system issues. When my A6 showed these symptoms, inspection revealed a failing fuel pump and damaged wiring connections to the pump assembly. The root cause was corrosion at the fuel pump electrical connector, causing intermittent power supply issues. The problem required replacing both the fuel pump and the wiring harness. This is a serious repair that requires proper diagnostic equipment and expertise. The fuel system in these engines is complex and attempting DIY repairs can lead to additional problems. The job involves dropping the fuel tank, which requires specialized tools and safety procedures due to fuel handling. Key indicators pointing to fuel pump issues: Engine stalling at idle, Hard starting condition, Significant performance drop, High fuel consumption, Active check engine light Given the age and mileage of your Q7, this is a common service point. Getting it diagnosed properly by a qualified technician will prevent potential cascade failures in other fuel system components.

Thanks for the detailed response about the fuel pump issue. Your description matches my symptoms perfectly, especially the engine stalling and hard starts. Before I book a repair, could you share what the final cost was for your fuel pump replacement? Also curious if youve had any other fuel system problems since the repair was done? Im trying to budget properly and want to make sure I fix everything while the fuel tank is dropped. The automotive diagnosis should be straightforward given how common this fuel injector problem seems to be on these models. Just want to avoid any surprises with additional auto repair costs that might come up during the job.

Since getting my A6 fixed last month, the car has been running perfectly with no engine stalling or fuel system issues. The repair was much simpler and cheaper than initially expected, it turned out the main problem was just a corroded connection to the fuel pump, not the pump itself. The total bill came to 95 Euro for fixing the wiring connection. The car mechanics found the issue quickly during their automotive diagnosis and didnt need to drop the fuel tank. Once they restored proper power to the pump, all the symptoms disappeared completely. The fuel consumption is back to normal and the engine runs smoothly at idle now. No check engine light since the repair. If your symptoms are truly identical, you might be lucky and have the same straightforward fix rather than needing a complete pump replacement. Just make sure whoever does the auto repair checks the electrical connections first before assuming the entire fuel pump needs replacement. This kind of targeted diagnostic approach can save significant costs while still resolving the core issue.

Thanks everyone for the great advice. Just wanted to update on how it turned out, took the car to a certified shop specializing in fuel system repairs. The mechanic confirmed it was indeed a faulty fuel pump causing the engine stalling issues. The repair cost came to 650 Euro including parts and labor. They had to drop the tank but found some corroded wiring while in there, so they replaced that too. The car mechanics were really thorough and even showed me the damaged components. After three weeks of driving, car performance is back to normal. No more stalling, steady idle, and fuel consumption has dropped back to usual levels. The engine starts right up every time now. Definitely worth getting it done properly by professionals rather than attempting any DIY fixes on the fuel system. Thanks again for steering me in the right direction with the diagnosis.