I had that happen once when I launched. The impeller was less than a month old. I figured a dobber had been in the pee tube. My son found a piece of .095 line from a string trimmer on the ramp. I ran it in the tube and dirt fell out. I started the engine and more dirt and a dobber larvae shot out.
I now double a piece of the line and leave it in when stored. I leave about 4 inches of line hanging out. It is red so I notice it when removing rear tie downs.
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