Hyundai Sonata Fuel and Fuel System Questions

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Comments

  • 73split73split Member Posts: 5
    i bought a 99 sonata with 93,000 miles nice car, but had two issuse one was it would start and idle great but when trying to take off no power so i replaced mas sensor seemed to fix it but it hesitate once today most of time does fine. 2nd problem when you put gas in the car it has a hard time trying to start let set for a few mins its fine and your off and starts everytime after that until you put gas in the car again
  • jlindhjlindh Member Posts: 282
    Sounds like the there might be a problem with the fuel vent canister. Any lights, codes? When you fuel up, do you hear any venting when you remove the gas cap? Leave the gas cap off after starting and see if you continue to have the same problem.

    Report back with the results.
  • 73split73split Member Posts: 5
    There are no codes, no venting when removing the cap and i tried leaving the cap off after putting gas in and it did the same thing.
  • smookdog1smookdog1 Member Posts: 3
    Get a K & N air filter. Don't know exact figures on gas mileage but getting 32 MPG on my 2009 Hyundai Genesis (Hwy mileage) with the new filter. About 4 MPG higher than factory specs and you will probably notice a little more Horse power. Will pay for itself quickly with gas prices now.
  • jlindhjlindh Member Posts: 282
    The question is, did the car CONTINUE to have the same problem as you drove it multiple times with the gas cap off? I believe that you previously stated that the problem previously occurred only on the first drive after a refill when the gas cap was in place.
  • 73split73split Member Posts: 5
    I didnt drive it around with the gas cap off did you want me to do that? yes it only happens on the initial start after fueling and it is good after that.
  • jlindhjlindh Member Posts: 282
    Yes, I'd like to confirm the problem is caused when the gas cap is removed to fuel the car. If the problem continues to exist as long as the fuel cap is off, that would be a pretty good indicator that the fuel vent system is compromised.

    Does anyone have any other ideas or possibly a comment on my idea?
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