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Need help with Husquavarna tractor

Discussion in 'Mechanic and Repair' started by CurbAppeal33, Mar 27, 2007.

  1. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Messages: 28

    I am a home owner and have a husquavarna 48" with a 24hp twin briggs and stratton engine.

    I am having trouble losing power after about 15 minutes of running the mower.

    This weekend I changed the fuel filter, oil and filter, air filter, and the spark plugs. The problem is still occuring.

    After I got everything changed, I started it up and let it run for about 20 minutes. The fuel filter filled up 3/4 full right off the bat, but after running 10 minutes or so, it was back to trickles of gas entering the fuel filter.

    I believe that I have something blocking the fuel line from the fuel tank itself.

    I was planning on changing the diaphram or regulator (the little black box that a tube leads into from the fuel filter) before I pull the fuel tank off or have someone tear apart my carborator.

    And suggestions? I need to have my mower running withing two weeks. THE GRASS IS GREEN!!!!
  2. hotrodsnapper

    hotrodsnapper LawnSite Member
    Messages: 85

    That sounds like your gas cap is not venting properly. Most gas caps have a vent built into them so that when the engine uses gas out of the tank, air can get in to replace the gas. Otherwise a vacuum builds up and you have what you are describing. Next time you run the mower and it starts to act up, stop and CARFULLY unscrew the gas cap. If this cures it, go buy a new gas cap.

    If this doesn't fix it, wait and get some advice and make sure you understand what the cause is BEFORE you tear into the carb. That's a headache well beyond what you have!

    The guys and gals in the mechanic and repair section of Lawnsite will be able to help you further. I’ll bet the moderator sees this thread and moves it there. Also, post up the engine and tractor model numbers, that will help greatly.
  3. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Messages: 28

    I think you might be on to something H.R.S. The same night I was doing all this stuff to the mower to try to get it to work, I called my buddy and he said to take the gas cap off. I did that and the mower did run better, but the fuel filter only filled back up between 1/4 and 1/2 full. But at least I could actually see gas in there instead of a light trickle.

    It definitely help when I removed my gas cap.

    Should the fuel filter be filling up all the way?
  4. grassmedics

    grassmedics LawnSite Member
    Messages: 109

    I had this problem happen to me, and it was a bunch of hair like material inside the gas tank. might want to take the tank off and the carb to make sure nothing is inside blocking.
  5. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Messages: 28

    Thanks for the response. The gas cap did not fix the problem. My brother-in-law has said the next step be the diapham or regulator. It is the little black box that the fuel filter connects to before running into the carb.

    I do think that I have to take off the gas tank because I think it is clogged as well.

    To do that do you have to take off the entire orange metal body??? The way I am looking at it, that seems to be the only way.

    All of your responses are appreciated... I have 3 acres of grass that about needs mowed. Definitely next week.
  6. hotrodsnapper

    hotrodsnapper LawnSite Member
    Messages: 85

    Have you gotten this fixed? I'm curious, and posting up the resolution will help future surfers. Was it clogged in the gas tank or did it involve the fuel pump or carb?
  7. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Messages: 28

    No it is not fixed yet!!! I have done the following. New fuel filter, air filter, spark plugs, looked at the diapham (check valve), and I cleaned the plunger on the bottom of the carb. ( it wasn't sticking)

    I tested the fuel cap and that wasn't the problem. The only thing I have left is the emptying the fuel tank and cleaning it. But my buddy that was helping me doubts that is what the problem is because the fuel was coming through the fuel line pretty steadlily.

    What do you guys think? I am running out of time. Thank god it is snowing here right now and I think it just bought me another week.

    Thanks to all who answer....
  8. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    Maybe an ignition coil is getting "sick" as it heats up.
    Does it seem like one cylinder is quitting?
  9. mverick

    mverick LawnSite Senior Member
    Messages: 307

    Take it to a mechanic. He'll fix it quick. You've tried all normal things.
  10. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Messages: 28

    Yes it does sounds like I lose a cylinder. I can just tell that power is not what it should be.

    The fuel filter is not filling up at all

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