Question about Chrysler Town and Country

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1996 Chrysler Town & Country, 3.8lt. Fuel tank, it is normal a lot of pressure? Most of the time it take at least 18 second to depressurized the fuel tank, also I noticed a false reading on the fuel tank indicator this happens when the tank is pressurized; after releasing the pressure of the tank, normal reading is achieved. Any suggestion.

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  • dewin171 Dec 29, 2010

    Charcoal canister sound more probable to cause the problem, on your alternative answer you mention a possible fuel pump fault that raises a question, if tank is getting a back pressure from the fuel pump them the fuel pressure output will be less causing abnormal iddle (fluctuation)? My engine run smooth and quiet. What about the fuel tank cap? Can may also cause this problem.

    Thanks for the imput.

  • dewin171 Dec 30, 2010

    I will conduct the check during the next day. Thanks

  • dewin171 Dec 30, 2010

    I will conduct the check during the next day. Thanks


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This is quite common on these vehicles. there should be no pressure. The tanks are vented through a pipe system to the charcoal canister. The canister is supposed to vent to the atmosphere, and when the engine is running, engine vacuum should draw fresh air back in through the canister to regenerate the charcoal.

It may need replacing or could be blocked up, I am unsure of the location on this model though, I can find out if that helps

you could be getting back pressure through the fuel pump, it needs bleeding through but if the problem continues then you may have either an injector fault or fuel pump fault.



Posted on Dec 29, 2010

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  • Dan Doherty
    Dan Doherty Dec 29, 2010


    I would be more tempted to say the cannister if the car still runs quiet, they have pipes that can be blocked up with dirt, or ice in cold weather this causes more pressure. injectors can **** in air and return it to the tank, although normally this would cause a slight loss in power. Have the cannister checked out before going any further.

    Hope that helps


  • dttech
    dttech Apr 07, 2012

    Injectors returning air to the tank? "Back pressure" from the fuel pump??? When you joke like that you need to tell people you are joking. Somebody who doesn't know any better might believe that stuff!

  • Dan Doherty
    Dan Doherty Apr 07, 2012

    @dttech , well you sure don't seem to understand it! yet it fixed the problem.

  • dttech
    dttech Apr 07, 2012

    I think I do understand it. This is what I do for a living and have been for the last 37 years. There is no "FIX" posted here that I can see. The last post from the asker was that he was going to "check on it". Clogged-up charcoal canisters, malfunctioning vent valves, - yes. However, Fuel pumps and injectors do not cause pressure on fuel tanks or EVAP systems.


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