Jaguar XJ car starts and dies immediately with no solution found on Jaguar XJ

Some Jaguar XJ owners report experiencing issues where the car starts and then dies immediately, which may be attributed to a faulty fuel pump that fails to deliver adequate fuel to the engine. Additionally, problems with the EFI ECU fuel pump circuit are noted as a frequent failure point, necessitating checks on the fuel pump relay and its connections. Owners also mention that malfunctions in engine components like turbos, ECUs, or injectors can lead to similar starting issues and immediate stalling. Furthermore, a problematic fuel system, including fuel delivery or pressure regulation issues, may cause the engine to start but die shortly after. To address these concerns, it is advised that owners have the fuel pump inspected and potentially replaced, check the EFI ECU fuel pump circuit, conduct a thorough inspection of engine components, and verify the functionality of the fuel system.