Question about Craftsman 25cc Gas Line Trimmer

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Replace fuel lines bubble will not prime carb. which line receives the filter?

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  • Craftsman Master
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This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank

Posted on Aug 23, 2010

  • Roy Cagle
    Roy Cagle Aug 23, 2010

    You should check the ENTIRE fuel system including the inside of the carb (small screen), the fuel filter and make sure all gaskets are airtight. Sometimes, check valves in the carb stick or fail...pull the two fuel lines off the primer and spray some WD-40 into the them and even remove the bulb itself and spray under it...sometimes this will "unstick" those stupid check valves and the bulb will prime again....don't be shy with the WD-40 load it up and let it work into the primer base assembly...don't use his PSI compressed air or harsh cleaners like carb spray and never soak these carbs. There are other check valves too for the Hi and Lo speed circuits.....more complicated than people realize I;m afraid.

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