Make sure you have a blower that works, and use it, it’s that simple. When I had inboards and I’ve ad lots, I ran the blower and open the dog house before starting, pain in the but be I never blew up lol. Maintenance is also big, make sure no gas leaks in the bilge area and anything that can spark( boom) seam to be a lot more blowing up now a day, one blew up in the parking lot at the marine few years back, dog house went flying 50 feet in the air,lots of people and kids close by when it happened, scary ****