I desperately need help solving an exhaust issue. I have an exhaust expansion chamber that is over heating. I have tried all sorts of options such as blowing air through the hoses, also water. I have checked the ports behind the impellar for clogs, none were found. I removed the expansion chamber and looked inside, no silt or blockage there. ANY IDEAS? The T-hoses that goes to each expansion tanks are producing very little water pressure, although i have found no blockage.