Question about Nissan Altima

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My gas tank on my 1999 nissan altima overflows every time I fill it up. Is this a sensor problem?

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  • junno2004 Sep 13, 2009

    Is there anything I should remove other than the gas tank cap? I could not see anything just by looking through the fill tube even with a bright flashlight.

  • junno2004 Sep 16, 2009

    Can you be more specific as to how I can get to this ball assembly you're talking about. I'm a novice mechanic and a step-by-step process would be more appropriate. thanks.

  • junno2004 Sep 16, 2009

    The solution you described sounds logical since my check engine light is indeed on. I'll bring my car to a parts dealer tomorrow to have it checked. I'll let you know as soon as I do. Thanks a lot.

  • junno2004 Sep 17, 2009

    The check engine light is off all day so I couldn't bring it to an auto parts store to have it checked. With this development, I guess we're back to square one. Any suggestions? Parts that need replacement, etc. thanks.

  • junno2004 Sep 17, 2009

    how do I check/inspect the evap canister?

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  • Master
  • 2,976 Answers

No. There isn't a sensor in the neck of the tank. When you fill up, don't pull the nozzle out to fill up the tube. The gas going in is normally around 60° and it will expand in the tank, if the outside temperature is higher than what it was when pumped. Gas pumps are required to have automatic shutoffs on the nozzles. When it clicks off, just fill it to the nearest dollar. The difference in gas that you put in, will save you the cost of watching ir run back out. It also won't ruin your paint if it isn't overflowing.

Posted on Sep 18, 2009

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  • Master
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Sounds like a vent problem on the filler neck. may be kinked or vent is stopped up

Posted on Sep 17, 2009

  • roberta3fan Sep 17, 2009

    It also could be a evap canister problem with the venting

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  • Master
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I would suspect a problem in the evaporative emissions system. If the check engine light is on, and I would suspect it is,then I'd suggest taking the car to an autoparts store and have them scan the computer for any fault codes stored. Most parts stores will do the scan for free. The check engine light is to alert you that the computer has noted a fault in one of the car's systems and getting the codes will show what the computer has identified. Some components of the evap system are a cannister to collect fuel vapors where they are stored until certain engine conditions are met, at which time the a purge valve is activated to evacuate the vapors from the cannister to be used in the combustion process. The purge valve solenoid could be damaged or faulty, the cannister could be clogged or restricted, or there could be a vacuum leak. These are some things that could cause the situation you describe, however, that is just speculation and getting the codes should help narrow down the cause of the problem. I am really sorry for your trouble and I hope this helped. Best wishes.

Posted on Sep 16, 2009

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  • Master
  • 426 Answers

There is a vent valve and a check ball in the fill tube. try seeing if either of these is clogged/ stuck. I have seen GM cars take gas very slowly as a result of this.

Posted on Sep 13, 2009

  • Xander  Kravitz
    Xander Kravitz Sep 14, 2009

    The ball valve, check ball asembly is at the base of the tank, actually in the tank and prevents gas thieves from putting a tube down your tank of syphon gas out. these stick closed.

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