I Emailed Jim Weir, mentioned earlier, and asked his opinion of this design and his comment was "Sorry, but I just can't comment on individual designs, ESPECIALLY on potentially explosive designs. Jim"
My question is: how much of an ignition source is this design (only the variable capacitor is inside the tank) and how likely is an ignitable mixture to be inside a gas tank.
I know this is an electronics forum, but maybe some have experience in this area to share.
Thanks
Kinarfi