Fuel problem

Ok so here is the full story I haven’t used my magnum 425 4×4 in about 3 weeks I went to start it this morning with no luck after checking everything including spark and gap I decided to drain the gas just incase it got water in it so I pulled the fuel line off the carb it was dry I though ok maybe it won’t spill any gas unless the motor is forcing the pump to work so I spun it over no gas so I squirted some gas in the air box put the fuel line on and the beast fires right up and ran perfectly even took her for a rip so my question is wtf happened

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