Hey I need some help changed impeller on water pump cranked it up it pumped ranked again later an it didn't I pulled foot again to look an there was some water an like oil all over inside of foot only place I can figure it could be is exhaust leaking in foot gaskets looked good but does that explain why pump quit pumping pulled pump cover an impeller still looks good put hose on down tube for pump an water came out weap hole so no blockage I just don't know what else to try please help thank you