I have a 1991 200 XP, has new water pump and thermostats. Can't find any blockage and it doesn't overheat but I get very little if any water pressure. Telltale seems to flow reasonable well. I have check water pressure gauge with a pressure tester and it works good. I took the lower unit off again today everything seems good, no blockages and water pump is turned the right way with key in place. I hooked a water hose directly to copper tube and got good flow out of thermostats housings (without engine running). I noticed with tstats in, if I put my finger on Telltale restricting it I would get good pressure reading. So basically what I'm asking is there suppose to be some kind of restrictor in the aspirator? If not what else could do to see more pressure?