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Vapor mist coming out water drain

tom

Regular Contributor
does anyone know what causes

does anyone know what causes a vapor mist to come out the water drain on 90 hp evinrude? Can this be crankcase pressure bypassing thermastats or maybe exhaust. Has happened a couple of times and stops when tapping on the thermostat housing. I just replaced the thermostats last year. The engine is hard to start in the water and I am courious if I am loosing crankcase pressure for the vro pulse line through the thermostats.
 
" Crankcase pressure and therm

" Crankcase pressure and thermostats are not related. Do a compression test, a spark test and check the choke /primer system.You prime the bulb on start up and this bypasses the VRO pump to put fuel into the carburetors. "
 
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