Used strimmer that I am repairing for use. Brand and type of strimmer here.
I have replaced the fuel lines as they had perished and added a new fuel filter. Strimmer starts and runs well at idle. It occasionally will die after a period of time but once hot it stays on continuously.
The problem occurs when I pick the strimmer up to use. At that point the engine runs rough; I get exhaust fumes; no power to the head and the engine dies.
I am hypothesising that the carb also needs a clean/replacement but would like a steer in case it is something else too.
If the fuel lines have rotted away, its a good bet the diaphragms in the carb are hard as an old boot. I would order a carb kit and do a thorough cleaning. If you intended on keeping the trimmer I would rebuild the OEM carb and avoid a cheap after martket version if possible. The OEM tends to miles better than aftermarket