Something seems really wrong if it takes you 20 min to fill half of your front ballast. Do you have a hard tank and a bow bag? I am guessing you have a single pump. I have the two pump system on my Craz, but it only takes 8 min to fill the hard tank and the bow bag. If the impeller is good and the pump is running, I don’t really have a clue what the problem would be. I would check for a kinked hose, or like the earlier post said look for debris in the lines or intake. I would assume you aren’t leaking water from the hoses or tank, as that would be obvious and your bilge would be kicking on. If that does work, I would contact a dealer or wakemakers and ask them.
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2018 Moomba Craz
6.2L Raptor 400
6 Pump Ballast, Autowake 2.0, Flow 2.0 Surf System
OJ 15x13 Wake Prop
Digital Cruise Pro 3 (paddle wheel)
Wetsounds Rev 10's
2005 Supra Launch 22SSV - Sold