Have you ever had your weed eater stop after you were using it and when you went to start it again it wouldn’t start. This happened to me and I had to leave the weeding and start cutting the grass. Before the grass I cleaned up the dog poop first. After the poop was cleaned up I tried starting the weed eater again and it started. I used full throttle with no choke. One pull and it started and I finished the weed eating. The engine must of been too hot to run and once it cooled off it ran fine.