87 comp temp / water pump issue

[h2o-ski]

On my last boat, at idle the water pump sucks less water than what the hose flows. 1800 rpms would be close to the flow from the hose.

If water is coming out the exhaust, your raw water pump is pulling water.

I also had an issue where one of the exhaust manifolds would get vapor locked. I would just pull the drain plug until water flowed. It would do similar to your issue and temps would spike until the vapor lock was removed.

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