Husqvarna Tractor Not Getting Fuel....

Discussion in 'Mechanic and Repair' started by CurbAppeal33, Apr 4, 2007.

  1. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Posts: 28

    I am a home owner with a 48" Husqvarna tractor. The engine type is a Briggs and Stratton 24 hp v twin ELS.

    My problem is after about 15 minutes the engine is receiving minimal fuel.

    I have put on a new fuel filter, changed the oil and oil filter, change the air filter, changed both spark plugs, plus took off the diapham to see if that was plugged.

    I think my next step is to take off the gas tank and gas line to clean it out?

    Also when running the mower for 15 minutes, the fuel filter is 3/4 full, but ends in just drops after fifteen minutes. The mower is receiving so little fuel, it is amazing that the engine stays running...

    The mower is used for residential use only on a 3 acre farm.

    PLEASE Help, I need to mow anytime!!! Any suggestions are greatly appreciated...
  2. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    Sounds like the vent in your fuel cap is plugged. Run you cap loose and see if it runs longer than 15 minutes. If it does then clean or replace the cap.
  3. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Posts: 28

    I forgot to mention I tried that also. I ran the mower without the fuel cap on to see if that was it. '

    The same problem occured. The gas stopped going into the fuel filter.
  4. topsites

    topsites LawnSite Fanatic
    Posts: 21,653

    Cut off the fuel, then remove the carb bowl and make sure the float is moving up and down freely, a sticking carburetor float mechanism can cause this problem. Before you start, make sure you have some carb cleaner spray handy, even if it doesn't appear to be sticking I would spray it down good, and I wish you luck!
  5. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Posts: 28

    How exactly do I do that Topsites?
  6. topsites

    topsites LawnSite Fanatic
    Posts: 21,653

    Ok, I'll explain it but if you don't know much about it, it might be best to take it to someone qualified.
    It's not that hard to do, but if you mess it up it's LOL'd.

    The carb bowl should be on the bottom of the carb, and should look like this:


    You're looking for that round shiny thing, not the top 2/3'rds is a carb in pieces, you just need to find the bowl.
    Yes, that perfectly round thing on the bottom with a flat bottom and round around, some are shaped more like a cone but that one is the usual shape.
    This round shiny bowl should be on the very bottom of your engine's carburetor.

    Notice the nut on the very bottom dead center, the very most bottom nut... As you loosen this, some fuel will come out because that bowl holds maybe an ounce or so, but beyond this you need to have the fuel supply cut off (or drain the gas tank).
    Don't take off anything but that nut (or bolt), it's just one.
    Once that is off, you may have to tap the bowl a little to get it to come off, if it's stuck on there.

    Beyond that, once you get that shiny round bowl off, you should see the float.
    It is similar to the float inside a toilet bowl in operation, meaning it cuts off / restarts fuel supply to the bowl.

    To gain a better understanding, you might restart the fuel supply and manually operate the float carefully up and down to see how it starts / stops the flow. Technically, fuel flows in until the level pushes the float up, which cuts it off.
    By the way, do this on a paved surface and be careful, parts like to fall off at times, you'll have to reassemble these.

    The bowl itself is where the carb gets its fuel from, a properly operating float ensures a continuous supply, one that sticks can cause supply to run low.
  7. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Posts: 28

    Topsites-I would like to thank you for taking the time to explain that to me. I am actually having a buddy that knows what he is doing help me fix this. He should know exactly what to do now.

    Once again, thank you.
  8. xjcamaro89

    xjcamaro89 LawnSite Member
    Posts: 6

    I have recently had the same problem with the same tractor, i have only 52 hours on the tractor after 6 months. Here is what i have observed, the fuel filter canister never fills up above 1/2, and then you can run the tractor and watch the fuel get sucked out till it is empty then if you let it sit, it will slowly fill up a little, and you can run it for another 15 mins, so i pulled all the fuel lines off and cleaned them out. Then, (and i dont know what made me do this) i flipped the fuel filter around so the arrow on the filter is pointing to tank instead of carb. As soon as i turned on the tractor on the fuel filter canister filled right up and the tractor ran and it seemed like the fuel kept coming in. So i dont know if that made the difference, or if the float just happened to break free while i was flipping the fuel filter? Anyone have any ideas or comments on this?
  9. CurbAppeal33

    CurbAppeal33 LawnSite Member
    Posts: 28

    That is an interesting idea. I will try this. My fuel filter never fills up to even 1/2 full. I would say a 1/4 full at the most. I mowed the first time this year and the mower seemed somewhat ok. Then on my second mow, the mower had about a 15 minute gap where it started to sputter and lose power. That happened after 25 minutes of mowing.

    Then it went back to normal.
  10. xjcamaro89

    xjcamaro89 LawnSite Member
    Posts: 6

    I really dont know why this would make a difference, anyones input would be great, but also, where is the vent for the gas cap? i dont see a tiny pin hole anywhere for a vent, can i drill a very small hole in the cap for a vent?

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