I have a question maybe someone could answer. I've been working on Evinrudes for 30 years.. Never had this issue. its a 1991 90HP.. Did T-stats, water pump, and head gaskets. I cannot figure out for the life of me why this water pump wont prime and pump water. It runs and pumps a little bit on a hose but if you put it in a barrel, covered all the way up past the split, it will not pump! It pumps fine if you run it in the barrel and earmuffs on, even if you take the muffs off while its running in the barrel but not on restart when taking earmuffs off in the barrel... What could possibly cause this? Checked the pump 2 times now.. I'm 99.9999% sure its in correctly. It aint my first rodeo... If you take the hoses off to the T-Stats and run a hose up the water tube it flows freely. Deflectors are OK in the heads/Block. Dont see any cracks anywhere I can see.. Only thought was a cracked water tube.. Going to check that with an inspection cam tomorrow... I'm baffled...