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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » '65 gas cap

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    8/25/2018 5:35 PM  #1

    retired 65
    I FYI 24-7

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    From: nixa, mo.
    Registered: 4/02/2013
    Posts: 336

    '65 gas cap

    Is the '65 gas cap originally a vented cap?  Does "vented" mean it lets pressure out and lets air in as fuel is displaced in the tank.  I have installed the FiTech EFI system and I don't want to collapse the tank. I see the valve in the cap that lets out pressure, but need to know if it works the other way also.  I can't see a way to install a vent/roll over valve in the system and get it higher than the fill pipe and be out of the trunk/passenger area. Thanks  Jerry

    "when I drop something, it always goes to center of the car"
     

    8/25/2018 8:00 PM  #2

    lowercasesteve
    Senior 24-7 FYI Addict

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    From: Auburn, Ca
    Registered: 4/01/2013
    Posts: 1,257

    Re: '65 gas cap

    I have a FiTech F/I  Still using the stock gas cap.  No problems.  I ran a vent line to the gas filler tube just under the gas cap in the trunk.  They say you can get by without one, but that means the  vent/return line vents down to the ground under the motor.  Not good.  No valve.

    Since, I have installed a command center with a hard line to the rear.  Works great.

    Original owner - 351w,T-5, 4whl disks, power R&P
     

    8/26/2018 11:19 AM  #3

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 517

    Re: '65 gas cap

    I have a 67 coupe and put my relief valve in the right rear quarter panel extension. Stole the idea from someone on here. Don't have everything hooked up yet though. Just enough room for it to sit vertically.

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
     

    8/27/2018 12:17 PM  #4

    retired 65
    I FYI 24-7

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    From: nixa, mo.
    Registered: 4/02/2013
    Posts: 336

    Re: '65 gas cap

    retired 65 wrote:

    Is the '65 gas cap originally a vented cap?  Does "vented" mean it lets pressure out and lets air in as fuel is displaced in the tank.  I have installed the FiTech EFI system and I don't want to collapse the tank. I see the valve in the cap that lets out pressure, but need to know if it works the other way also.  I can't see a way to install a vent/roll over valve in the system and get it higher than the fill pipe and be out of the trunk/passenger area. Thanks  Jerry

    Can anyone tell me if the gas cap on a '65 will let air back in the tank in addition to letting pressure out of the tank?  Thanks  Jerry
     

    "when I drop something, it always goes to center of the car"
       •Thread Starter
     

    8/27/2018 2:27 PM  #5

    TimC
    I FYI 24-7

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    From: Wheaton, Illinois
    Registered: 4/01/2013
    Posts: 877

    Re: '65 gas cap

    Jerry, I have no direct experience, but I remember Bullet Bob having an issue with the tank building pressure and not venting out through the cap vent on his 66.

    http://fyi.boardhost.com/viewtopic.php?id=3356

     

    9/17/2018 12:40 PM  #6

    602Raptor
    Active Member

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    From: Phoenix, AZ
    Registered: 4/20/2017
    Posts: 7

    Re: '65 gas cap

    Speaking of gas caps, what are everyone’s thoughts on these?

    https://www.speedwaymotors.com/Speedway-Large-Cobra-Style-Fuel-Filler-Neck-Gas-Cap,53672.html

    This forum doesn’t like the “,” in the URL so you have to copy / paste.

    Last edited by 602Raptor (9/17/2018 12:48 PM)

     

     

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