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CRAFTSMAN 42" kolher 15.5 hp. will start but have to leave the choke on or set it to idle.when running it surges. disconnect fuel line and crank it over and seams to be getting enough gas. but look at fuel filter and seams to only be less than half full with little gas coming from tank. took cap off. no difference. took carb apart and cleaned. did this twice so far. thinking it might be a venting problem. there is a hole on the left side that i cleaned out. rather deep hole. replaced fuel filter. cleaned and checked plug took wire connectors apart and cleaned. put dielectric grease on connectors. blew air back through tank. any thing else that it might be. it was working fine for the first hour of mowing. shut off to refill with gas. ran for 10 minutes or so then started having problems. thanks scott

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  • Scott Lehman
    Scott Lehman Aug 01, 2009

    Thank You.
    Will try it tomorrow.
    Little update for tonight.
    Had the tail end up in the air while fixed the brake and was thinking.
    When I put it back on the ground noticed that the carb was full of gas. Bumped it and cylinder full of gas. Took out plug. Shot lots of gas out of cylinder. Put in another new plug. Started up. Running with full choke on. Dropped down to idle died. Restarted. At idle noticed that at idle, that there is gas blowing back through the choke. Tore carb apart again. Took float all apart. Checked it over. No gas inside float. Cleaned needle and seat. Both looked good. Put back together started up. Same thing. Called it a night. What does the solenoid on the float bowl do. Tried to take part but didn't want to wreck it. Ohms were at 22ohms. Seams a little high. Will read it again in case I read it wrong . Getting way to dark and the bug were eating me alive.

    Thanks again for your insight. More tomorrow.

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Check the electric fuel solenoid make sure there is voltage to it when engine is running.This model may have 3 relays on the engine harness and one of them is tied into the fuel valve try switch relays.Also check connectors on ignition switch sometimes one terminal can get corroded and cause problems.Also check the plunger on it to be sure it is moving freely.Also the fuel filter is usually half full,there is almost always some air in it.


Posted on Aug 01, 2009

  • jlcarty5 Aug 01, 2009

    The fuel solenoid cuts fuel to main jet when ignition switch turns off.Maybe the carburetor is overfilling.Take the air filter housing off and watch it while it is running,if it is overfilling gas will be running out end of carb.If it has fuel pump you have to check this while running if it is gravity feed you can check it with engine off for seepage.It may have a bad inlet needle seat or a piece of grass on inlet seat,sometimes the only way to fix is replace carb.

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