Cleaning A FloScan 201
It was recommended to me to use Hoppe's #9 gun cleaning fluid - fill the impeller cavity and gently rock back and forth, then expel the fluid and flush with avgas. It worked for me, but I kind of like the idea (offered above) of using brake cleaner instead.
There are (probably) all kinds of reasons why some of us have a "sticky" impeller that needs service once in a while, and others - not so much. But, if you do have intermittent ops, and have ruled out electrical, and upstream flow issues, there may be some relief in using this method.
YMMV - and heck, it may not even help at all!
HFS