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Why will my weed trimmer start but not stay running?

My weed trimmer starts but won't stay running. It is a Craftsman. model no. is 536773400.

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Craftsman , Hand Gardening Tools
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Manage My Life
I am no expert but a C1U-W19 is not a walbro carb it is a Zama carb Rb kit117 mod gnd64. you can find this on the Zama web site. It will list all zama carbs and cross referance to modle and size the modles whice I estimate is over 100 to the Rb # and the Gnd # which for the C1U-W19 Carb the RB-# is 117 the GND-# is 64 I had the same peoblem with my poulan pruner and I was working it as a Walbro untill I took the diaphram cover of and saw the name Zama. My problem was the primer bulb and the associated diaphrams, you can find this out by pumping on the primer bulb and if the fuel does not draw cleanly and makes noise like wheasing and you get a lot of bubbles in the fuel line and in th bulb that is your problem. It fixed mine and I didnt have to take the cab off. hope this helps.
by Manage My Life
October 6th, 2012
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