I have an Essex primer on a Supercub. Last week it worked normally, this week it has zero suction. Anyone know what the normal fault mode is? I need a new 'O' ring?
There are some small ball bearings, held in place by weak springs, that form the valves. You may have a piece of crud under one of the balls? If you have to open it up then you will almost certainly need need to replace any o rings. If you do dismantle it, the springs can shoot the balls a surprising distance, and the balls are small and difficult to find (don't ask me how I know).
Small particles were always messing up my Kohler primer on my Champ. Even after I flushed the tank it still would stop up. That little tiny hole in the intake manifold would stop up and keep it from working too.
