started having a problem with my 2003 250xb water pressure, it idles at 3psig when i first get to the lake but will only hold 10psig at wot, later on idle pressure is only about 1.5psig - wot still 10psig, the only way i can get pressure up is to drop jackplate 5'' below pad. i have installed new impeller, checked for any blockage,blew out gage tubing, changed gages, rebuilt popit valve---- nothing has helped---- looking for any more suggestions, also no alarm has gone off to show overheating THANKS