1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 352Get this manual
Gasoline! Handle Wi th 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
By Volume
Gasoline fumes are heavy and will sink to the lowest point in the boat or room and will Stay there Waiting