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Dolmar 420 tank vent help

Discussion in 'Chainsaw' started by striperswaper, Nov 6, 2012.

  1. striperswaper

    striperswaper AboristSite Guru

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    have a new/old PS 420 with about 3 partial tanks thru it. after running abit it starts to run lean, stop it open the fuel cap and hear the air rush in. figure its the the tank vent so where is it and how to get to it easily, recall BradS build on this saw some time back the plastics were a pain... so how much has to come off to find the vent?

    thanks in advance for your help and suggestions

    Cal
     
  2. Stihl-Pioneer

    Stihl-Pioneer Addicted to ArboristSite

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  3. striperswaper

    striperswaper AboristSite Guru

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    thanks S-P , I can sort of see where it is just wondering how far down I have to go, is there some sort of short cut to get to it?
     
  4. SawTroll

    SawTroll Information Collector

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    Don't really understand the last question?

    The part number is 170 175 010, ref number 7 on page 1 of the IPL....

    Actually it is two parts, but only one part number.
     
  5. 166

    166 Addicted to ArboristSite

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    The vent is located just below the choke lever on the fuel tank. Right in the center of the picture. I haven't had to replace a vent on a 420 but you should be able to get it out with a pick. The 2nd picture shows a vent for a 5100/7900 series the vent is the same but the cover is different. They did make a change to the vent a couple years ago. The older vents were green the new ones are orange in color.
    [​IMG]

    [​IMG]
     
  6. goosegunner

    goosegunner ArboristSite Operative

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    Have you checked your primer bulb over? Mine had a small crack in it and had similar issues.

    gg
     
  7. striperswaper

    striperswaper AboristSite Guru

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    thanks 166, it is so obvious now. pulled it and seems to breath fine. how could the primer bulb affect tank venting?
     

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