I wasn't clear enough I think: With Ed's pump the metal impeller is pinned and the pulley cannot seize due to the rubber coupling. With the original factory design it is possible for the pulley to seize regardless of the impeller material (AFAIK.) Thus, if I'm correct about the factory design, then it isn't "as good as that new WP that has the rubber clutch/coupler pulley."

Regardless, I don't want to get into a debate. Ed's quite capable of clearing up any issues of design, understanding, or semantics.

 

You are right. I just don't know how common is for the shaft to sieze without the impeller being pinned.