There are 5 owner-reported fuel system complaints for the 2001 Hyundai Sonatain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
BAD FUEL VAPOR SMELL IN CABIN, NO CHECK ENG LIGHT ON. CHECKED ENG LIGHT AT AUTO ZONE ANYWAY, CODE SAID VAPOR VALVE GOING TO CANISTER/DUMP AFTER WARM UP. HYUNDAI BY PHONE SAID CANISTER NEEDED REPLACED($400+). I LIVE ON DISABILITY SSI, TOO EXPENSIVE. TOOK TO SMALL GARAGE, AFTER LIFTING, BOTTOM OF GAS TANK WAS WET WITH GAS(BY THE EXHAUST). ONE GUY WENT TO ACCESS POINT FOR FUEL TANK FOR REPLACING FUEL PUMP. A 6 INCH RUBBER HOSE CONNECTING THE LINE OUT OF THE FUEL TANK CONNECTING TO METAL RAIL FUEL LINE BENT AT OVER 90 DEGREES, HAD A HOLE AT THE WEAKEST POINT, IN THE INSIDE BEND. I AM NOT THE FIRST OWNER, BUT [XXX], COULD ONLY DRIVE IT AFTER MIDNIGHT IN HOT SUMMER. CODE EXPLAINED CAR AFTER WARM UP OPENS THIS VALVE TO DUMP VAPOR BUILD UP IN CANISTER. SOUNDS RIGHT, CODE AND EVERYTHING, AFTER I FINALLY HAD THEM CHECK FOR CODES WITHOUT CHECK ENGINE LIGHT NOT COMING ON. SUCH A CHEAP COST OF A RUBBER HOSE COULD HAVE EASILY BEEN A BRADED FLEXIBLE METAL CONNECTION. [XXX], I'M LUCKY. I GAVE HYUNDAI DEALERSHIP REPAIR GUY OVER THE PHONE THE ENGINE CODE. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR
I SMELLED GAS INSIDE THE CAR AFTER PARKING. COULD SEE NO VISIBLE LEAKS AT FIRST. ON JUNE 12 COULD SEE FLUID DRIPPING FROM MIDWAY UNDER CAR, MADE SERVICE APPOINTMENT WITH DEALERSHIP TO REPAIR VEHICLE. THEY DIAGNOSED PROBLEM AS A RUSTED FUEL LINE UNDER THE DRIVERS SEAT. SERVICE DEPARTMENT ESTIMATED COST AT $2,100.00 DOLLARS FOR REPLACING FUEL LINE AND FRONT AND REAR BRAKES. SEEMED RELUCTANT TO DO REPAIR OF FUEL LINE, MENTIONING HOW THE BRAKE LINES ARE ALSO LOCATED NEXT TO THE FUEL LINES, LENGTH OF TIME ORDERING PARTS AND HOW COMPLICATED THE REPAIR IS ALONG WITH THE RUST IN THAT LOCATION. LOOKING FOR REPAIR SHOP TO DO THE REPAIR TO AVOID A FIRE. *TR
WHILE DRIVING THE CAR DRAGGED, AND WHEN GETTING OFF THE GAS IT SLOWED DOWN REALLY HARD AND STARTED JERKING Y BADLY. TOOK IT TO A SHOP, AND THE COMPUTER READ THAT AIR WAS GETTING IN THE GAS, OR SOMETHING LIKE THAT. THEY SAID IT COULD BE A NUMBER OF THINGS, BUT IT WAS A MANUFACTURING PROBLEM. FINALLY, I TOOK THE CAR TO GET FIXED, AND THE MECHANIC WON'T FIX IT BECAUSE THERE WAS NOTHING WRONG WITH IT. WHAT DO I DO. *AK
THE CONSUME SMELLED GAS. AFTER TAKING THE VEHICLE IN FOR SERVICE IT WAS DISCOVERED THE FUEL REGULATOR WAS LEAKING FUEL INTO THE ENGINE. *NM
DEFECTIVE SENSOR FOR THE FUEL PUMP CAUSING VEHICLE TO STOP DEAD. OTHER YEARS AND MODELS WERE RECALLED. *JB
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026