Super Jet Cavitation under heavy throttle

[mattg1.8]

I've been experiencing what feels like cavitation under heavy throttle. I pulled the grate off today to check things out. I noticed a decent gap between the wedge and the pump housing is this an issue that could cause the cavitation? I got some pics for reference.

 

[speedysprocket]

Your pump seal should fill that gap. Can you see light through it?

 

[jo5hi3]

Easiest thing to do is what speedy said. Take a flash light and shine it inside the seal area, see if you can see light passing through.