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Thread: Excess fuel tank pressure

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    Default Excess fuel tank pressure

    Is our gas cap vented or sealed? I have a ton of gas pressure in the tank.

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    Quote Originally Posted by recessbilly View Post
    Is our gas cap vented or sealed? I have a ton of gas pressure in the tank.
    So...when you open the gas cap it goes PSSSHHHHH?
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    Alldata says tank is sealed/pressurized, whatever you want to call it. Maybe this link will work and help out

    http://www.alldatadiy.com/alldatadiy...2939/219036752

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    All modern fuel tank systems are sealed and pressurized to an extent. Thats why you get a code set if you forget the cap. They should have a max pressure so if the tank seems to be overpressurized you might need a new cap anyway. Not sure if Alldata will have the spec or you might need to see a Ford service manual.
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    Is it overpressurized, or under a vacuum? Fuel caps are supposed to hold a vacuum, but bleed off positive pressure.
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    She threw a P0453. Not sure where to go with it.

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    http://www.alldatadiy.com/alldatadiy...4763/145866962

    Just geussing, but I'm going to say maybe the FTP sensor helps to control the EVAP purge solenoid which would eleviate the pressure on the tank.

    http://teamzx2.com/threads/39407-Fue...ensor-location


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