Which would be the easiest & quickest experiment to do?
Firstly & most importantly the fuel has to be neutralised, irrespective of the methodology, unless, that is, unless you want to suck petrol vapour up adjacent to a sparking motor.
Half an hour, probably less, would have a blanking plate screwed over the pump hole & an adapter taking the filler pipe inlet to the hose on an energetic vacuum cleaner or vacuum pump.
A glamorous assistant to help & let the magic begin.
It not all that mad cap & after all we’ve covered some far out ideas on here, some as far out as the Kuiper Belt.
M

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