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  1. #1
    Buck3yeRideR's Avatar
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    Fuel tank vent necessary?

    I'm pretty sure the vent valves on my fuel tank are not working properly as my tank becomes pressurized during operation and relieves a gasp of air when i take the cap off of it. This got me thinking, Can i just remove the valves and run a straight vent or is this a bad idea?

    Also read on another thread the someone said just to cap it off and totally eliminate a vent tube.


  2. #2
    WFO 4 LIFE nitrosportman's Avatar
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    no you need the vent it was put there for a reason, to keep water out and fuel in, prevent vacuum locks and pressure buildup

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Tank needs venting. Best option is to replace the check valves with new ones. Safe, works well, no issues.

    If you remove the check valve and vent the hose directly to the rubber hull fitting then the carb tuning will need adjustment to compensate for the absence of controlled air pressure in the tank.

  4. #4
    Buck3yeRideR's Avatar
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    ok i'll just replace the check valves then. Any cheap solutions to replacing them vs. buying oem?

  5. #5

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    as long as it's pressure and not vacuum your ok ,it should have a pound or 2 of pressure ,for new ones buy oem that way your not buying someones used junk

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Buck3yeRideR View Post
    ok i'll just replace the check valves then. Any cheap solutions to replacing them vs. buying oem?
    OEM parts are not that expensive.

  7. #7

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    I had to buy one for my old Polaris, think it was 7 bucks?

  8. #8
    Buck3yeRideR's Avatar
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    yes it has pressure, to the point where i can't unscrew the gas cap by hand and have to use channel locks. Hence the reason i thought my check valves are toast. Or is it supposed to be like this?

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Buck3yeRideR View Post
    yes it has pressure, to the point where i can't unscrew the gas cap by hand and have to use channel locks. ...

    ... Or is it supposed to be like this?


    The gas cap should not be that hard to remove.

    Btw, you can install the newer generation Polaris gas filler neck and gas cap. Works well, and you might prefer the newer style look.

  10. #10
    LaveyT's Avatar
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    Quote Originally Posted by Buck3yeRideR View Post
    yes it has pressure, to the point where i can't unscrew the gas cap by hand and have to use channel locks. Hence the reason i thought my check valves are toast. Or is it supposed to be like this?
    Thats probably just too tight when installed. I used to overtighten the cap all of the time. It was harder to loosen than to tighten.
    I just installed the newer Polaris/Seadoo filler neck and cap. It took me a couple of hours. Just a half round file and maybe a "Rat Tail" file is all I used. The sheet molded compound is incredibly soft and the files open the hole up in a flash. (the new filler neck is slightly larger).

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