mercury 60hp outboard 1983 - Fuel choking off after 10 mins

by john tice
(grasonville md)

I have a mercury 60hp outboard 1983 motor. I recently had the mid-casing replaced because it was cracked. The motor is running very well but after approx. 10 min of run(full throttle) the fuel starts to choke off and the engine begins to shut down. Sometimes it stops all together and other times it will still run in idle. After I shut it off and let it cool some it will run again wide open but again the fuel will choke off after 10 min. Not sure what the problem is here. My impeller is pouring water out so I know it's working.

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