150 Mercury EFI alarm


New Member
Oct 10, 2012
Guelph Ont. Canada
I took my boat out for the first time this year and had it idling for about 10 minutes at the dock and went to leave and got an alarm constant.
Took of cover to check oil injector reservoir it was ok but the alarm came on every time I started engine
Took boat back out of the water drove home hooked up waterhose to flush out cooling system put on earmuffs and started the engine. Alarm was gone but I think the engine cooled off during the drive home so no alarm. There is no water coming out of the sight hole at the top but there is air pressure coming out. Anyone know what could be causing this problem ? I am planing a yearly trip next week so I need to get this fixed maybe at a dealer.
Thanks Lutz