Where in the fire code does it say gasoline may not be stored indoors

code-compliancefire-hazard

Re Seattle fire code, but site this applies to most U.S. cities.

I think it is forbidden to keep a fueled or formerly fueled gasoline generator indoors, esp in a commercial, multi tenant building.

But the code is so big, I don't know how to find the relevant rules.

Suggestions?

Gasoline is allowed indoors. However, the occupancy then becomes H-2, and fire walls, ventilation, etc. are required. (See Section 307.4)