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Mercruiser Engine Stalls After Replacing Calorifier

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Hello folks,

Random question, wonder if anyone has any tips.

I had the boat engine serviced last week so I know its all good-ish. This week I replaced the old water heater with a small 10 litre calorifier. Having removed the old hot water lines from the engine I found they were completely blocked, so I unblocked them before attaching them to the new unit. Now the engine starts but stalls in idle, but thats the only change I have made. Anyone got any ideas as to why this might be happening or is it likely unrelated?



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Does it have an auto-choke operated by the cooling system? Could be an air lock making it think the engine is stone cold and over fuelling.

I'm assuming petrol engine here.

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