A7 Fuel Pump Failure Signs & Diagnosis Help Needed

The symptoms match what I experienced with my 2015 A6 3.0T. The fuel system issues showed identical signs, hard starts, rough idling, and increased consumption. The automotive diagnosis revealed a failing fuel pump control module, not the pump itself. The connector pins had corroded, causing intermittent electrical contact. A proper fuel system inspection found the wiring harness near the pump had chafed against the chassis, compromising the connection. This caused erratic fuel pressure and the symptoms you describe. The repair required replacing the wiring harness and control module to restore proper fuel delivery. This is a serious but fixable issue that needs prompt attention. Continued driving risks damaging the fuel injectors from inconsistent pressure. The repair should include: Full fuel system pressure testing, Control module diagnostic scan, Inspection of wiring harness condition, Testing electrical connections at pump, Verifying injector operation Recommend having a qualified shop with experience in Audi fuel system repairs handle the diagnosis. The symptoms point to electrical rather than mechanical pump failure based on their pattern.

Thanks for your detailed response about the fuel system problems. Your insights about the control module and wiring harness really helped narrow down my car performance issues. I took my A7 to a specialized shop that works on high-end German cars and their auto repair diagnosis matched your experience perfectly. Did you track the total repair costs for fixing the electrical issues and wiring? Also curious if youve had any engine stalling or gasoline delivery problems since getting it fixed. The shop quoted me around 2500 Euro for the complete repair including parts and labor, so wondering how that compares.

Good news, after fixing the faulty cable connection to the fuel pump control module, my A7 has been running perfectly. The car mechanics found the exact same issue you described during their automotive diagnosis. The final bill came to just 95 Euro for repairing the connector and pins, which was a relief compared to replacing the entire pump. Since the repair 8 months ago, I have not experienced any engine stalling, rough idle, or fuel delivery problems. The quoted 2500 Euro seems quite high if the issue is just the electrical connection like in my case. A proper inspection might reveal you only need the connector fixed rather than a complete pump replacement. The key was having a thorough diagnostic check that identified the actual source of the pump failure. My recommendation would be to get a second opinion focused specifically on testing the electrical connections before agreeing to a full system replacement. The symptoms can look identical but the fix could be much simpler and less expensive.

The mechanic visit turned out much better than expected. After getting the thorough fuel system inspection, they found the same electrical connection problem that was mentioned. The actual repair only cost 890 Euro, way less than the original quote, since they only needed to fix the wiring harness and clean the corroded connector pins rather than replace the entire fuel pump. The auto repair shop completed the work in one day. They also performed a complete diagnostic scan to ensure there were no other underlying issues causing the pump failure. The car now starts instantly, idles smoothly, and fuel consumption is back to normal levels. The gasoline delivery system works perfectly after fixing those electrical connections. Really glad I asked for advice here before authorizing the more expensive repair. The proper diagnosis saved me over 1600 Euro and fixed the problem completely. Three weeks later and zero issues with stalling or rough running. The check engine light has stayed off and everything runs like new.