I don't know if these pics will help much, I will get the info on the pump.
I got the boat used last year; I know nothing about its history
Also this boat steers very squirrelly at speeds just before it on a plane, i know this is a Jet boat characteristic , but this boat you must be really on the steering wheel turning it, then over correcting.
It's in the shop getting a new yellow updated paint job.
Maybe the new paint job will make it run faster? :-)
Mark
Mark when you get up, tear yourself away from the phone :jawdrop: and go over to the shop where the boat is and take a few photos of the jet inside the engine cover and the outside