Does it stop sucking water gradually, or all at once? When your thermostat opens, it does so slowly and should be fully open at 160* (if thats what t-stat you have in there). Have you verified that all hose clamps and connections are tight? No leaky hoses or water intrusion in the boat, correct? If there's no blockage, you have a fresh impeller, all connections are tight, and all hoses are good, the only thing left really is your raw water pump.
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