This is just a thought, a theory.
In another life I supplied air movers of the type shown, you provide a compressed air supply at around 4 bar at the threaded port shown.
The locking ring allows adjustment of the unit on a large screw thread, the units are assembled in 2 halves, this way you adjust the suction..
It utilises the coanda effect, for every litre of air supplied it pulls 7 litres through its body.
It is essentially an air powered vacuum cleaner, no electrics required, except of course at the compressor.
They come in various diameters, small enough to fit a tube that will go down the fuel filler end of a fuel tank.
So, you can with a piece of flexi tube and a compressor clean out the tanks, safely hopefully.
The bigger the compressor the more suction you get, but an average garage compressor can do the job.
it is best to fit a tube at the exhaust end, otherwise you get petrol soaked crap all over the workshop.
 

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