Hi guys,   Those of you who have followed my threads over the last few years will remember the issue of the step-up-piston hanging up.  No doubt do to slight corrosion in the housing by alcohol flashing off the bowl and getting sucked past the step up piston by engine vacuum.   I now check that piston every six months.  A stuck closed piston will cause a lean condition at freeway speeds and that is not a good thing.   A week ago I did my 6 month check and things looked good except that the