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Not enough fuel????

Discussion in 'Lawn Mowing' started by spencer087, Sep 21, 2009.

  1. spencer087

    spencer087 LawnSite Member
    Posts: 73

    OK. i have a john deere xt120 trimmer. thats the main problem. the second problem is that it seems to not get enough fuel? i have cleanede it three times now. if i slightly choke it i mean barley it runs fine but whe choke is offf anf i open it up then it bogs and dies because of too much air. it would seem to me that this would be a simple adjustment but theres one problem. NO ADJUSTMENT SCREWS!!!??? i dont know how i can adjust the carb on this trimmer
     
  2. jhawk60

    jhawk60 LawnSite Member
    from VA
    Posts: 241

    Are you sure it's not getting enough fuel, or could it be not getting enough air to do anything but barely idle on partial choke? Have you tried running it with the air cleaner off?
     
  3. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    A worn spark plug will make it do that, too, replace that.
     
  4. spencer087

    spencer087 LawnSite Member
    Posts: 73

    when i barley put it on choke it is restricting air which makes it run better. so its either too much air ornot enough fuel. and spark plu is possible although its a almost brand new spark plug and i replaced it when it started doing this a few onths back got sick of it after a few days and use it off and on every so often since it works at partial throttle. spark plug had alot of white buildup on it when i looked at it earlier. i have forgotten what this means though. not enoug fuel i beieve?
     
  5. jhawk60

    jhawk60 LawnSite Member
    from VA
    Posts: 241

    I had a Shindaiwa trimmer that did this, had to choke it a little to keep it running. If you opened the choke or touched the throttle it would die. Popped the air cleaner off and it ran fine. Replaced the filter and it was good to go.
     
  6. Shasta Lake Landscaping

    Shasta Lake Landscaping LawnSite Senior Member
    Posts: 436

    Make sure all carb. screws are tight, also did you check spark arrestor screen in the muffler?
     
  7. spencer087

    spencer087 LawnSite Member
    Posts: 73

    all screws tight spark and cleaned the spark arrestorscreen. this is a very weird issue i know
     
  8. MikeKle

    MikeKle LawnSite Platinum Member
    Posts: 4,253

    It could also be that little vent tube. I had an echo that was doing the same thing and I tried everything, even replacing all the fuel lines without any luck. then I noticed that vent tube,(kinda looks like a very small fuel filter) I took it out and repalced it. It ran fine after that? I had never even noticed it before. But I dont think every trimmer has these?
     
  9. heather lawn sp

    heather lawn sp LawnSite Senior Member
    Posts: 681

    In-tank fuel filter/pick-up will restrict the fuel flow. Filter shold be replaced at least annually. You are right there are no adjustments on these carburetors
     
  10. brucec32

    brucec32 LawnSite Platinum Member
    Posts: 4,403

    Having the same situation with an echo blower. Cleaned carb, exhaust, fresh fuel properly mixed, new fuel filter, pulled the vent cap, new properly gapped plug. Ran it w/o air filter. Nothing improved.

    runs well slightly choked. Much slower at normal setting. And again, no carb screws to adjust it with.

    I am noticing some oil buildup in the metal carb intake/choke area when I remove the rubber air intake from it. What is that an indicator of?

    All other 2 cycle stuff is running fine, so it's not a fuel problem. Compression is 65 psi. Other echo blower that runs perfectly and has low hours was only 60! I'm not sure what the spec should be but that makes me think it's not a wear problem.

    Stumped.
     

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