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92Lex

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Posts posted by 92Lex

  1. larryp,

    A malfuntioned EVAP purge valve may cause a very slight increase in pressure, if any. But definitely not enough pressure to cause any damage to a fuel tank. The charcoal canister would probably be the first to go.

    I'm not sure what happened to the fuel tank in your car because I haven't seen it for myself. My guess would be that your car had a defective fuel tank to begin with and it slowly cracked over the years or your car has too much chassis flex.....maybe even a crooked mechanic.

    larryp and logic,

    Why do you guys assume that there is too much pressure in your tanks? Is it from unscrewing the fuel cap and hearing a lot of vapor escape? But anyways. Maybe the EVAP canister is over-saturated and is no longer able to "catch" the fuel vapors.

    There isn't much reason to be worried about fuel tank vapor pressure because there isn't much pressure anyways. If you are experiencing hurricane like vapor wind and fuel splashes then yeah, be worried. I'd be more concerned with high fuel pressure in the fuel delivery system.

  2. An EVAP canister is designed to hold the excess hydrocarbon vapors and purge it into the intake during closed loop, cruising speeds. Have you ever tested an EVAP system? You can only introduce 1-2 lbs of air into the test valve before it becomes a dangerous situation. So how much pressure did it take to "bend" your fuel tank?

    You know how I know that a clogged EVAP canister will not bend a gas tank? Well, ummm...I've removed the EVAP canister from my current car. The lines for the EVAP canister are plugged/capped off.

    Oh yeah, I'm also an ASE certified auto/smog tech.:cheers:

  3. A clogged EVAP canister can cause excessive pressure to build up eventually to the point of bending the gas tank and causing a leak. The gas cap is designed to let air IN when the pressure in the tank is less than outside air pressure but does not allow excess pressure in the tank to escape. Not saying this is your problem but it could be. Do a search on my userid for leaking fuel tank and read the saga i went through...:whistles:

    Please....one pound of additional pressure will not bend a gas tank...that's absurd. Do you even know what an EVAP canistor was desgined to do?

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