Are the Deluxe gas caps vented?

Discussion in 'General Maverick/Comet' started by 55crownvic, Mar 9, 2015.

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  1. 55crownvic

    55crownvic Member

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    Doesnt look like mine is, there is no hole on the backside. I would like to have it vented, so dont know if i can just drill a hole or if that will destroy the emblem.:huh:
     
    55crownvic, Mar 9, 2015
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  2. 71gold

    71gold Frank Cooper Supporting Member

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    another benefit to having the later model gas tanks...:yup:
     
    71gold, Mar 9, 2015
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  3. 55crownvic

    55crownvic Member

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    yeah, oh well, I am just going to solder a small tube to the top of the filler neck and then run a hose down to the rear sill, that should do it.
     
    55crownvic, Mar 9, 2015
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  4. Corbin Johnson

    Corbin Johnson Member

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    I have a deluxe vented cap on my 70, so yes, they did make them and they are out there.
     
    Corbin Johnson, Mar 9, 2015
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  5. Mavaholic

    Mavaholic Growing older but not up!

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    As far as I know the 70 was vented and the rest are not. But its very easy to make a vented cap. There is a hole in the center on the backside. You can suck air in through the hole but cant blow it out. There is a check valve in there. Just take a drill the size of the hole and carefully drill out the check valve. Be careful not to go all the way though. Its a fairly easy process and with light pressure you will feel when the valve is drilled out. Never drilled through the back cover yet.
     
    Mavaholic, Mar 9, 2015
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    Paul Masson likes this.
  6. 71gold

    71gold Frank Cooper Supporting Member

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    did one of mine like this...:thumbs2:
     
    71gold, Mar 10, 2015
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  7. jasonwthompson

    jasonwthompson Member

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    I have owned a number of the deluxe caps, some were vented and some were not.
     
    jasonwthompson, Mar 11, 2015
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  8. Acornridgeman

    Acornridgeman MCCI Wisconsin State Rep Moderator Supporting Member

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    Even the 70 had a non vented version - they were used on the cars with the 14 gallon tank and that giant vapor tank in the drivers side trunk well.

    Do you have a picture of the cap in question?
     
    Acornridgeman, Mar 11, 2015
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  9. 55crownvic

    55crownvic Member

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    heres a pic, BUT, I already have the solution. I Installed a fitting in the top of the filler neck and attached a curved length of 5/16" brake line to it, then ran a length of fuel line to the trunk floor. Perfect!! If u want I can prob get sum pics of that setup tomorrow.

    IMG_2088.JPG
     
    55crownvic, Mar 12, 2015
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  10. 71gold

    71gold Frank Cooper Supporting Member

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    yes please...:Handshake:
     
    71gold, Mar 12, 2015
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  11. 55crownvic

    55crownvic Member

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    filler neck vent pics.....

    IMG_2105.JPG IMG_2108.JPG IMG_2104.JPG IMG_2103.JPG IMG_2109.JPG
     
    55crownvic, Mar 12, 2015
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  12. Acornridgeman

    Acornridgeman MCCI Wisconsin State Rep Moderator Supporting Member

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    I was looking for a picture of the inside of the cap - to see if it has a vent.

    I want to get into what the factory vent does for a minute. The vent is a one way valve that lets air into the tank as the fuel is used. On the sealed systems the air enters the tank through the vapor carbon canister. The vented cap does not allow the tank to vent out while parked - only to let air in to replace the fuel as it is used. If the cap vented out while parked, the "lights" in the fuel would evaporate and escape and you would have a strong smell of gas around the car, specially if it is parked in a garage. On cars with the vapor recovery charcoal canister, the make up air enters through the top of the vapor can. The gas cap is a sealed cap with no vent on cars with a vapor recovery system.
     
    Acornridgeman, Mar 12, 2015
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  13. 55crownvic

    55crownvic Member

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    the inside of the cap is solid steel, no holes at all, so I am assuming it isnt vented.
     
    55crownvic, Mar 12, 2015
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  14. Acornridgeman

    Acornridgeman MCCI Wisconsin State Rep Moderator Supporting Member

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    Correct

    If you have the cap with vent you will see it right away in the center of the cap - if the valve is working correctly you can suck air in through it but not blow air out through it.
     
    Acornridgeman, Mar 12, 2015
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  15. groberts101

    groberts101 Member

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    Eric brings up a good point here. If the vehicle is stored for longer periods of time without frequent fillups, it's good to keep in mind that open vents can and often do cause loss of octane, add to sedimentation buildup, and allow more water to build up causing higher reates of internal fuel system corrosion and contamination.

    Not saying don't do it.. just that there are some extra considerations involved due to the added variables introduced with this type of system.

    PS. one way vented valves which are being described above are one of the many caveats for these old cars. Fuel can change its volume to affect its displacement within the tank based on temperature swings. This can result in moderate pressure buildup which can cause pressure creep at the carb. Then add an old log style 6 cylinder under the hood with exhaust manifold cozy'd up right next to the carb?.. and you guys know what typically happens.
     
    groberts101, Mar 12, 2015
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