I am needing to know the size of string the Stihl fs66 uses. It is a dual line. Also can you buy the gas cap gasket alone or just buy a new gas cap. If I tilt it a little gas drips out of it. Guess I should try a determine if the threads are somewhat damaged. Sometimes a cap will feel tight but are not actually snugged down. Looking at the underside of the gas cap the gasket appears intact.
