Question about 2002 Hyundai Accent GL

4 Answers

Gas tank, pressure??

I filled up a little last night, about 2 gallons, I was on empty. Drove about 40-50 miles, went home almost on e again... next morning my check engine light comes on and the midas guy said it was a specific hyundai code, said it might be the pressure of the tank and they would have to look at it... My car sounds fine, but may be sucking more gas?? idk help

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  • julie d
    julie d May 02, 2015

    I put premium in sometimes, is that bad?

  • julie d
    julie d May 02, 2015

    I think I also may not have clicked my tank shut all of the way. I did 2 clicks and now noticed is says on the cap if it doesn't click 3 times the check engine light might come on... it hasn't turned off yet tho it's been 3 days

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4 Answers

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  • Hyundai Master
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We cant guess, DTC codes here,
why ask people to guess them,. of the 100s
no only that , where is your question. ????
if you cant scan it your self, (the tool can be had for 10 bucks)
or get some to do it and then ask them to give you the code.
then if you can do either thoses, the get the car serviced by a real shop , Midas is not.
try a real ASE shop (full service shop wins)

Posted on May 02, 2015

  • Anonymous May 02, 2015

    if the code is for EVAP, tighten the cap, reset the codes to 0 (tool push button). and drive, if its passing now, bingo, you now are in the other millions that did this over and over, if the code for EVAP returns try a new cap, it's cheap., then if (IT)returns, get the system pressure tested. next, if that fails,(it leaks) then fix that (ask), if that passes we must test all evap parts, lacking any clear defined DTC error code. all this is covered in the FSM if you can read it, and see the EVAP page, better yet, read the DTC error page first that is after, writing it down first.

  • Anonymous May 02, 2015

    why ask blind, deaf folks how to fix a car.with zero inputs.

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  • Hyundai Master
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Really need a code to tell you where to start. What they told was EVAP. This doesn't effect mileage to much, unless it is causing a vacuum leak. Go to a parts store, they read the codes for free. Repost with the codes. I have one that got 32 MPG. Lost an O2 sensor and when to 29 MPG.

Posted on May 01, 2015

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  • Expert
  • 94 Answers

When you remove the fuel filler-cap, do you notice vapor being pushed out, or air being sucked in? The answer can lead you toward the cause of a problem.
Newer vehicles are required to use an (EVAP) or fuel vapor capture, and recovery system. This system directs vapors from your fuel tank toward an activated charcoal canister, where those vapors are captured, and then burned via an engine air intake tube through the purge valve at a later time. Safely preventing their escape into the environment is the goal.

First, a properly functioning gas-cap is crucial to a functioning EVAP system, as it allows air in, but not out, thereby preventing a destructive vacuum from forming in you fuel tank, while preventing vapors from escaping into the atmosphere.
(A faulty gas cap can look like a big leak to the computer during self diagnostics)
Fuel tank vacuum, resulting from a faulty gas-cap, can cause a fuel pump to overwork unnecessarily, and definitely increases the likelihood of premature failure of that pump.

Conversely, excessive tank pressure can be caused by the failure of one, of multiple vent valves designed to keep vapors moving in one direction through the recapture system. A properly functioning purge valve is the last valve in this recycling system, there is also an electrically operated vent valve on the charcoal canister which is normally open, and allows air to escape after fuel vapors have been captured. The charcoal vent valve has an open-ended vent tube that can become clogged with debris. Insects love building nests in these vent tubes, and personally, I have added a small piece of metal screening over the end of the canister vent-valve tube to prevent this from happening. It also allows for easier inspection.

When you're refueling your vehicle, the fuel being added displaces vapors in the tank. Those vapors are then forced up, and out through the tank vent vale(s) on the top of the fuel tank. From there the vapors are pushed toward the fuel filler-neck, where there's a double-walled chamber designed to capture any refueling vapors, then all vapors are forced back to the liquid separator,(if equipped) and finally from the liquid separator, to the charcoal canister for recapture, and temporary storage.(Air is vented out the canister vent valve) When any one of these valves fail, vapor pressure can build.
The purge valve is periodically opened as part of diagnostics during leak detection testing by an on-board computer. Vent valves on top of the fuel tank are designed to close both in roll-over conditions, and when the fuel level in the tank is full, via a float mechanism which prevents liquid from entering the recapture system lines.
Also there's a check-valve at the base of the filler neck, where it connects to the fuel tank, this check valve is designed to prevent fuel 'splash-back' during refueling.
Understanding your EVAP system, how, and why it works, can be of great help when trying to diagnose any problems, and I hope this information helps resolve your problem.
https://www.youtube.com/watch?v=nIZ4EGknw2Q

Posted on May 02, 2015

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  • Master
  • 371 Answers

Sounds like your purge valve for the EVAP system is stuck open. it is supposed to release fuel tank pressure into the engine, instead of the atmosphere, but if it gets stuck open, your engine sucks fuel and vapor out of the tank all the time creating a large vacuum condition that should set a code for fuel tank pressure out of range. Needs professional EVAP diagnostics by a trained mechanic.

Posted on May 02, 2015

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