The photo that Crosbyman posted above shows a float pin that appears to be made of steel. Every float pin I have ever seen was made of brass and they don’t “corrode”. They just get dirt and varnish on them. In any case, if you clean out the valve chamber and spin the float pin as I described above and that solves the problem, no more is needed. If it doesn’t solve the problem then the float pin can be removed and cleaned or the float may need to be replaced.
