Can/does wringing out a petrol-soaked chamois leather cause a fire from
a static electrical discharge?

In the 50s I began learning to fly (Tigers at Dirranbandi with Darling
Downs, but to my eternal regret, I was unable to complete due to work
pressures, financial priorities, new marriage etc.), and we were
instructed never to wring out the chamois in the filter-funnel after
refuelling from drums.

I've since often wondered if this was in reality a risk; have there been
documented incidents, and is the precaution still observed where
applicable? It always seemed to me that there were many more
possibilities of generating a static spark than wringing out a wet
chamois, but no-one ever seemed to worry about grounding straps, etc.

JW²
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