there should be like a zero percent chance of a meaningful build up of fuel vapors in an open air setting where the vapors have to make out of the narrow choke of the fuel tank opening, where the nozzle and its rubber splash guard thing are blocking its route, and all the way to where the speaker is

Sure buddy, handle one of those with a cigarette and see what happens. (/s fucking dont)

Do you by any chance have any experience working with electricity to back up your concerns?

I have diplomas on the subject, professional experience and training, yes. Engineering regulations are written on blood and cemeteries are full of smart asses that dont follow them, that all I have to say.