1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Manual, P/N 507263, Page 350Get this manual
Gasoline! Handle With Care Gasoline vapor and air mixtures explode easily and violently when mixed as shown Part Gasoline
When you smell ANY odor of gasoline, explosion is possible
20 Parts Air
By Volume
Gasoline fumes are heavy and will sink to the lowest point in the boat or room and will Stay there Waiting
!GAS FUMES
What Can You Do?
If the air around you is quiet the pilot light in the heater may ignite the heavy fumes before you nose ever smells the fumes Store in sturdy, approved sealed Gas Can and Keep Outside