Jaguar X Type Fuel Pump Issues & Poor Performance Fix

I had nearly identical auto repair problems with my 2004 Jaguar S Type last year, and having gone through the diagnosis process myself, I can share my experience (as someone with some experience working on cars). The symptoms you describe match what I encountered, poor starting, engine stalling, rough running, and the check engine light. After initial automotive diagnosis, it turned out the core issue wasnt the fuel pump itself, but rather a damaged wiring connector going to the fuel pump assembly. The workshop found that the cable connection had deteriorated over time, causing intermittent fuel pump failure and irregular fuel delivery. They replaced the wiring harness and connector assembly, which cost 95€ for the complete repair. Since the fix, the car performance returned to normal with no more stalling or starting issues. However, before suggesting this is definitely your problem, it would help to know: Have you scanned for specific error codes? Does the problem get worse when the engine is hot? Can you hear the fuel pump priming when you turn the key? What is your current mileage? These details would help determine if your issue is similar to what I experienced or if there might be other underlying problems with your fuel system.

Latest service was done at 136000 KM. Your symptoms match exactly what I experienced with my X Type before the automotive diagnosis revealed serious pump failure. The gasoline delivery issues got progressively worse, especially during hot weather. After scanning, error code P0171 confirmed the fuel system was running lean. After monitoring fuel pressure readings and checking all connections, the workshop confirmed my fuel pump needed complete replacement. The repair restored proper engine performance and eliminated the stalling completely. My mechanic mentioned these fuel pump issues are relatively common on our model year when reaching around 130000-140000 KM. The complete auto repair including parts cost 780€. The car runs flawlessly now with no engine stalling or rough running issues. Consider getting fuel pressure tested to confirm if you have the same underlying problem.

Thanks for the detailed follow-up about your X Type repair. The P0171 lean code matches what my S Type showed during automotive diagnosis. However, my repair costs were significantly lower since only the wiring needed fixing, not the entire fuel pump assembly. After hearing your car performance improved with the pump replacement, I should mention that my initial wiring repair was only a temporary fix. About 6 months later, the same symptoms returned, rough engine running and stalling issues. The mechanic then discovered the fuel pump itself had degraded, causing inconsistent fuel system pressure. The complete fuel pump replacement on my S Type cost around 750€, very close to your repair cost. The car has run perfectly for 25000 KM since then with no engine stalling or fuel delivery problems. For anyone else reading with similar symptoms, its worth checking both the wiring connections and fuel pressure. Sometimes fixing the wiring alone can mask a failing pump temporarily. Full pump replacement might cost more upfront but provides a more reliable long-term solution for proper car performance.

Having checked the fuel pressure readings as suggested, the mechanic confirmed a failing fuel pump delivering inconsistent pressure. The error code P0171 matches exactly what others experienced, pointing clearly to fuel system issues. Glad I asked here before proceeding with repairs. The auto repair was completed yesterday, with full fuel pump replacement costing 780€. The car performance has improved dramatically, no more stalling, smooth idle, and normal fuel consumption. The mechanics also inspected the wiring connections mentioned by others to ensure they werent contributing to the problem. Based on feedback here and from the workshop, these fuel system problems seem common in X Types around 130000-140000 KM. For anyone experiencing similar symptoms, getting proper automotive diagnosis with pressure testing helped confirm the exact issue. The repair cost was significant but necessary to restore reliable operation. Thanks for sharing your experience. The insights helped me make an informed decision about the needed repairs and what to expect during the process.