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  1. #1

    '95 SL750,Fuel Tank Vent Valve P/N 7051015

    Prior post about fuel flooding engine while parked, possibly caused by a sticking fuel tank vent valve, not releasing tank pressure.(outside air temp 110 F)

    I cut it apart to see how/why it would not pass air when blown through(mouth pressure)

    Nothing inside except spring, valve and rubber seat--pretty simple---

    What am I missing here ????


  2. #2

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    Not sure how the polaris are set up, but most of those valve are designed to let air in and not out. They are called check valves. Look and see if there is an arrow on the body. You should only be able to pass air in the direction of the arrow. I just looked at my parts SLT750. Is this what you are talking about?
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  3. #3
    well most are designed to maintain around 3psi! some setups use 2 one to let air in and one to maintain around 3psi to help with fuel delivery

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by ZMANN View Post
    well most are designed to maintain around 3psi! some setups use 2 one to let air in and one to maintain around 3psi to help with fuel delivery
    Correct ^^^^

    TX has the pic of a check valve to let air IN.

    But there's a check valve at the top (around steering) that releases too much pressure at 1.5 psi. It does aid in fuel delvery like Z mentioned.

  5. #5

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    so there is a "pressure relief" valve as well as the "vacuum relief" that I have pictured?

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by TXLEARMECH View Post
    so there is a "pressure relief" valve as well as the "vacuum relief" that I have pictured?
    Yep, #13 http://partsland.com/index.cgi?N=121...50-FUEL-SYSTEM

    The check valve you have pictured is a one way valve to let air IN, It's not a "relief" valve at all.

  7. #7
    13 and 10

  8. #8

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    Quote Originally Posted by xlint89 View Post
    Yep, #13 http://partsland.com/index.cgi?N=121...50-FUEL-SYSTEM

    The check valve you have pictured is a one way valve to let air IN, It's not a "relief" valve at all.
    Actually it is! It lets air in to "relieve" a vacuum that could be created in the tank. Just a general term!

  9. #9
    Correct .....the valve pictured is the ..IN ..valve.

    My question...was,..... seems like a simple set up. I can't imagine why it would not release system pressure ?????

    Construction is simple but the spring seemed to have much higher tension than 1 1/2 lbs (polaris manual ) to off seat it.

    Maybe the one in my ski was the incorrect one, installed by someone in the past ???? and system pressure never got high enough to force fuel, back to the engine,through the return line.

    Another Polaris Mystery....

  10. #10
    in my experience if they fail open and don't let the psi build the only issue you may notice is hard starting , and if u have a primer you won't even notice that! however it is best to maintain the system as designed

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