does

[Bernie]

I have a Ryobi ss30 trimmer that starts hard and will only run at half choke and dies when I go to the Run position. I replaced the fuel lines and filter and it still does the same thing. I'm thinking the diaphragm in the carb might be weak. Can I get a replacement rather than replacing the whole carb itself? Do you think the problem is elsewhere? The carb itself is clean.

[6thmarine]

Check your fuel/oil mixture if it is oil heavy it will cause this problem.

[Chris]

Mine had the same problem and I fixed it by replacing the gas cap. It sounds too simple to work, but there is a little white valve in the center of the cap. Over time, the material breaks down and won't allow the tank to vent air in as the gas is pulled out. It only runs with partial choke because that creates more suction on the fuel line to compensate for the vacuum in the tank.