"In my opinion and observation, I like the Hepu propeller design better since it "looks" like it can cut through water without much resistance."

In mine, I want the resistance to be there. But no cavitation. Bubbles form when a pump is inefficient, as well known to your swimming coach. You might want your torso to cut through the water, but you want your hands and feet to meet resistance to your arm and leg muscles.

But ever since that Airtex episode I imagined building a plexiglass test plate to evaluate the pumps at varying RPM (which makes all the differences with cavitation). Then I could say more than "looks like."

By the way, I was not recommending GMB over Hepu. The unused Hepu is still on my shelf. The GMB in the car is not producing any issues either. But I shy away from buying an Airtex, which by the way, I bought locally on a Sunday before a trip, just for the square o-ring used on the heater pipe.

--
Art Benstein near Baltimore

A man will pay $20 for a $10 item he needs. A woman will pay $10 for a $20 item that she doesn't need.