2017 Kia Cadenza

I have and am the original owner of a Kia Cadenza 2017 with the 3.3L Lambda engine (same engine as the Sorento lawsuit). The vehicle is currently at the dealership getting repaired due to carbon buildup causing the fuel injectors to malfunction( despite of consistently being on top of maintenance and oil changes).I have read online of lots of users with failed engines due to carbon buildup in these engines. The warning lights I got were p0171,p0174, and p0191, and am worried that after the repair the engine will eventually fail due to the buildup as the main issue isn’t properly being addressed. The issue occurred about 300 miles ago where the dealership erased it. Then told the vehicle did not have any issues. Brought it back to the Kia dealership where they finally gave a proper diagnosis after being told nothing was wrong with car. I am concerned as there are lots of owners online experiencing the same issues with their Kia cadenzas and nothing done about it. Took the vehicle in after it stalled in traffic, but, as seen, the repair cost is high and a temporary band aid.

THIS IS A CONTINUATION OF PREVIOUS NHTSA COMPLAINT ID 11047835. THE STRONG RAW FUEL ODOR AFTER FILLUP RECURRED ON MY VEHICLE AT 9550 MILES, 3600 MILES AFTER THIS PROBLEM WAS SUPPOSED TO BE FIXED. DEALER CLAIMS TO HAVE REPAIRED GAP IN THE PREVIOUSLY-REPLACED HIGH PRESSURE FUEL PUMP SEAL; HOWEVER, FUEL SMELL REMAINS WHEN TANK IS FULL UNTIL DEPLETED TO ABOUT HALF. I ASK NHTSA TO INVESTIGATE THIS RECURRING PROBLEM WITH THE KIA CADENZA.

SHORTLY AFTER FILLING FUEL TANK A STRONG RAW FUEL ODOR EMANATED FROM THE LEFT SIDE OF THE VEHICLE NEAR THE FUEL DOOR. THE SMELL WAS MOST PRONOUNCED OUTSIDE THE VEHICLE. INITIALLY I THOUGHT SOME FUEL HAD SPILLED, BUT THE SMELL LASTED SEVERAL DAYS UNTIL THE TANK WAS DEPLETED TO 1/2 FULL, AND IMMEDIATELY CAME BACK UPON NEXT FILL UP. NO CEL OR CODES WERE THROWN, AND DRIVABILITY WAS NOT AFFECTED. DEALER SERVICE DEPARTMENT INITIALLY MISDIAGNOSED PROBLEM AS CLOGGED FUEL VENT LINES, BUT ON THE SECOND VISIT THEY APPEAR TO HAVE CORRECTLY IDENTIFIED THE ISSUE AS A LEAKING SEAL AROUND THE HIGH PRESSURE FUEL PUMP ATOP THE VEHICLE'S FUEL TANK. DEALER INVOICE NOTES THE FUEL PUMP GASKET WAS "TORN APART." (THE INVOICE INCORRECTLY NOTES THE SMELL WAS APPARENT INSIDE THE VEHICLE, NOT THE OUTSIDE.)