1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 337Get 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
What Can You Do?