raymcbride
New member
Hello everyone! I have picked up a echo CS 3400 at a swap meet. I clean the carburetor and replaced the primer bulb and all fuel lines and filters. It would start and run screaming with the choke on but when I would pull it off it would die. After messing up the fuel adjustment screws I bought another carburetor online and put it on and it does the same thing. I managed to get it running for a short while but it will not keep running. To me this seems like it might be an air leak but I'm not sure where it would be. Also does anyone know anything about a check valve on this model. Could that be the problem? I looked it up on a diagram online but I actually cannot find where it is exactly at. Any help would be muchly appreciated. Thanks.