In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

MS 290 Farm Boss

Discussion in 'Chainsaws and Power Equipment' started by Jim1978, Jul 12, 2023.

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  1. The Wood Wolverine

    The Wood Wolverine

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    I too agree, no doubt fuel builds pressure when heated, but I’ve never heard of increased throttle making fuel leak out more.
    Husky doesn’t use that style vent so my experience was only 2 times on 2 different Stihls (that were for flipping :D). I replaced both.
     
    The Wood Wolverine, Jul 13, 2023
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  2. buzz-saw

    buzz-saw

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    The only time I might think it would maybe leak more is on a full tank. Vibration causing the fuel to be shaken around in the tank when it is full and closer to the vent. The reason I think of this is I have a gas hedge trimmer that had a dried out grommet for the fuel line , this was at the top of the tank. If I ran it on a half tank it would leak a tiny bit , if I filled the tank it would leak way worse. OK at idle but when trimming it wasn’t happy. I’m sure tank pressure did not exist in this case.
     
    buzz-saw, Jul 13, 2023
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  3. Screwloose

    Screwloose

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    Is it possible that it is pushed in the tank to far ?
    Just guessing, never saw a screw as a vent.
     
    Screwloose, Jul 13, 2023
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  4. brenndatomu

    brenndatomu

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    I'd be surprised if you don't have a saw with a grub screw vent...
     
    brenndatomu, Jul 13, 2023
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  5. buzz-saw

    buzz-saw

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    This whole grub screw thing to me is a cheezie way out. Maybe if the vent was taken from filtered air after the air filter then maybe ok. Otherwise it is unfiltered air in a dusty environment getting sucked into the tank , yeah I know it is not a lot of air but over time I would think it would start clogging up.
    Sure something like a carb on a car engine has air bleeds in the carb but these are after the air filter so they are breathing filtered air.

    This is just me thinking out loud so take it for what it is worth.
    To me this is just a hack job for a vent. No filter and no one way check valve.
    Agree or disagree I would be ripping it out and installing something different.
     
    buzz-saw, Jul 13, 2023
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  6. Jim1978

    Jim1978

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    It doesn't push into the tank, the vent tube slides onto a nipple on top of the tank. I did notice that it didn't seem to leak fuel as bad or at all as the fuel level decreased, but after installing the grub screw vent tube and running the saw it is definitely pushing fuel out the top of the vent tube around the screw, so I don't think vibration alone could do that.
     
    Jim1978, Jul 13, 2023
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  7. Jim1978

    Jim1978

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    Jim1978, Jul 13, 2023
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  8. brenndatomu

    brenndatomu

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    Meh...no big deal IMO...almost every carbureted motorcycle (dirtbike/ATV) ever made has an unfiltered/vented carb and tank...
     
    brenndatomu, Jul 13, 2023
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  9. The Wood Wolverine

    The Wood Wolverine

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    Flash back to my old dirt bike with the tube straight up out of the filler cap to the triple clamp. :thumbs:

    upload_2023-7-13_12-31-7.jpeg
     
    The Wood Wolverine, Jul 13, 2023
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  10. The Wood Wolverine

    The Wood Wolverine

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    Maybe your fuel line is leaking?

     
    The Wood Wolverine, Jul 13, 2023
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  11. Jim1978

    Jim1978

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    No, I've watched the fuel spit out the vent tube nipple and around the grub screw in the new vent tube.
     
    Jim1978, Jul 13, 2023
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  12. The Wood Wolverine

    The Wood Wolverine

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    Just get a Husky? :whistle:
     
    The Wood Wolverine, Jul 13, 2023
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  13. Eggshooterist

    Eggshooterist

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    I get what you're saying but I'd wager way more junk gets in the tank from people not cleaning off the cap and surrounding area before filling it.
     
    Eggshooterist, Jul 13, 2023
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  14. Screwloose

    Screwloose

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    Probably..... memory's going downhill.
    Can't remember if I even had lunch......
     
    Screwloose, Jul 13, 2023
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  15. MasterMech

    MasterMech The Mechanical Moderator

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    OEM equipment on a lot of saws up until Y2K or so. Especially smaller units.
     
    MasterMech, Jul 13, 2023
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  16. eatonpcat

    eatonpcat

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    I can help...I know you had lunch Brotha!!:p
     
    eatonpcat, Jul 13, 2023
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  17. brenndatomu

    brenndatomu

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    Hey, a big block needs lots of fuel, right?! :thumbs:
     
    brenndatomu, Jul 13, 2023
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  18. Eggshooterist

    Eggshooterist

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    Can confirm
     
    Eggshooterist, Jul 13, 2023
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  19. Jim1978

    Jim1978

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    update: Finally got an OEM vent tube and vent on it...works like a charm, no fuel leakage at all like I was having with the grub screw vent tube.
     
    Jim1978, Aug 3, 2023
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  20. brenndatomu

    brenndatomu

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    So what type of vent is it?
     
    brenndatomu, Aug 3, 2023
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