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Craftsman, Walbro 424C venting issue

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68red440
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2018/05/19 10:45:55 (permalink)
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Craftsman, Walbro 424C venting issue

My Craftsman leaf blower starts OK, runs for a minute or two and then slowly dies like it is starving for gas.  When I push the priming bulb, a small amount of gas sucks out of the tank into the bulb, but then the bulb gets hard and does not push gas into the carb.  I removed the carb, pushed the bulb and the small amount of gas that was in the bulb, did not push out.  I rebuilt the carb this winter, but I am having the same issue before and after the rebuild.  I cleaned the metal parts in Berryman's carb cleaner and blew compressed air through the passages. What passage(s) would be blocked that would prevent gas flow?  I didn't replace the welch plug because I wasn't sure if I would install it properly, but I don't know if that would cause this issue.
Any thoughts?  Much appreciated.

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    AVB
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    Re: Craftsman, Walbro 424C venting issue 2018/05/19 13:48:46 (permalink)
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    I am sorry but soaking the cube in carburetor just destroys the delicate internal non replaceable rubber check valves. There is no way you had removed them prior to the soaking of the cube. Also you should never use high pressure compressed air to blow out the carburetor.
     
    As for the primer not pushing fuel out then the exit check valve is stuck closed.
     
    With what you have done it would be best now to just replace the carburetor.
     
    BTW I never use anything strong the fuel mix the carburetor is designed to use. Most times all I use is soap and water in my ultrasonic cleaning machine. And then only light blow dry the carburetor afterwards.
     
    Mikel1
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    Re: Craftsman, Walbro 424C venting issue 2018/05/19 21:35:35 (permalink)
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    Yeah, AVB is dead on right. I seen one just like this caused by just using compressed air. Purge bulb will get really hard, people like to call them primers but most are purge bulbs.
    68red440
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    Re: Craftsman, Walbro 424C venting issue 2018/05/19 23:05:33 (permalink)
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    Thanks for the input.  I just bought a new carb for only $14.  I should have done that in the first place, but at least I learned something.  I'm used to working on carburetors on old cars which are totally different as far as rebuilding and cleaning.  I knew that rubber parts shouldn't go in the cleaner, but I didn't realize those pieces were captured inside the cast cube.
    AVB
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    Re: Craftsman, Walbro 424C venting issue 2018/05/20 07:46:18 (permalink)
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    At least it was one those cheap cubes instead of one those $100 cubes.
     
    I don't know why Walbro even sells spray carb cleaner. Generally if I know the user have tried to clean a carburetor on their own I generally know I am in trouble. Normally I have close to 95% successfully rebuilds but there will always those that can't be rebuilt. I got a C1Q-W11 that the metering needle seat is leaking around it mounting area so it is getting a new carburetor of those that blower carb have been reworked several times over the years.
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