Question about Craftsman 25cc Gas Line Trimmer

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Craftsman weed trimmer primer bulb is working in reverse

I have a Craftsman 2-cycle weed trimmer (25cc). The fuel lines broke off from deteriation so I replaced all of them. Now when I try to prime the fuel to start, nothing is being suctioned from the tank. In fact, I tested the primer bulb and it appears to be pushing air into the main fuel line (line goes from the carb into the tank with the little filter at the end) and suctioning air from the purge line (line goes from the carb to the tank). It appears that the primer bulb is working in reverse. It starts up no problem when I pour a little fuel directly into the carb, but won't continue to run and doesn't pull any fuel from the tank.

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  • jmaranhao Jul 27, 2010

    There are 2 lines: One leading from the carb into the tank with a small fuel filter on the end that flops around. The other line (smaller diameter) runs from the carb to the top of the tank. I swapped the lines and it now seems to work. Strange it is not how it was originally as the lines are 2 different sizes (the larger line fits on the smaller nipple, but is not as snug).

    It now seems to stall when I tip it to the side.

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Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Posted on Jul 20, 2010

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Sounds like your lines are reversed. If Suzu answer doesn't change anything then, reverse your lines, and see what happens.

Posted on Jul 27, 2010

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The fuel line WITHOUT a strainer will go from the tank to the OUTSIDE primber bulb connection then from the primer bulb center connection to the carb. Item 7 this link comes with the diagrams:
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Grass-trimmer-weed-wacker-Parts/Model-358791072/0247/1503820/P0808034/00002?blt=06&prst=0&shdMod=358791072

There are several you tube videos here on replacing fuel lines:
(do not delete) utube.png
Something to note... inside the tank there is a fuel filter/strainer. Make sure to replace that fuel line also. The connection from the strainer will connect straight to the carb fuel mainfold connection. The center connection of the primer bulb will go straight to the carb fuel manifold.

http://www.fixya.com/uploads/images/1CE2BC8.gif (Expand to 200%)

Thanks for choosing FixYa,
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