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hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
58,382 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Hyundai Sonata fuel system problems

fuel system problem

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2004 Hyundai Sonata Owner Comments

problem #4

Aug 012013

Sonata 6-cyl

  • 110,350 miles


After filling the gas tank full, found fuel leaking from the tank onto the ground. Removed the tank from the car and found 13 rust holes on the top and side of the fuel tank. Holes were found beneath areas of sealant that had separated from the tank surface.

- Memphis, TN, USA

problem #3

Jun 232010


  • 47,000 miles
The contact owns a 2004 Hyundai Sonata. While adding fuel to the vehicle the contact noticed there was a small valve on the outside of the fuel tube that fractured and possibly had fallen into the fuel tank. The contact smelled a strong fuel odor emitting in the interior of the vehicle after it was started. The manufacturer was made aware of the failure and informed the contact that the vehicle was not covered under the warranty; therefore, he would be responsible for the diagnostic cost. The vehicle was not repaired. The approximate failure mileage was 47,000.

- Staten Island, NY, USA

problem #2

Jun 232009


  • 76,177 miles
I have a 2004 Hyundai Sonata V6 that gives me problems when I fill the gas tank up. I know that this might sound crazy but, when I go to start the car, it will not turn over. I recently had a major tune-up done on the vehicle along with changing the timing belt. When I fill up my car, I have to include an additive such as gas treatment, lucas gas treatment, fuel cleaner, etc. I had my mechanic look at the vehicle four times and he has found nothing wrong with the vehicle. I ask for assistance to diagnose the problem and would you recommend bringing the car to a dealer. Please help! thank you. The system would not allow me to enter my VIN number.

- New Llano, LA, USA

problem #1

Aug 012005

Sonata 6-cyl

  • miles
2004 Hyundai Sonata had complete fuel system replaced. The consumer could hear load moaning and rumbling noises like pressure building up in the gas tank. The dealer replaced the fuel pump twice but the problem recurred.

- Lakewood , CO, USA

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