Intake hose is reinforced.
Joker valve on output is good.
I took apart the pump, again, and did some prodding and sucking. It appears the brand new flap valve on the intake is not seating perfectly. It seemed like it might have been a touch too long, so i trimmed it. I also put a light coat if silicon grease where it sits.
This created a very tight seal, and the pump works perfectly, for now. The grease will probably not last long, so i hope the trim solved