Blah Blah know all about siphoning Monster tanks and doesn't seem to miss an opportunity to post pictures of an example of that going on in his home County! Nuff said!
De-humidifier sounds like a neat idea, but taping up the cap sounds wrong. Surely it needs to breath for the de-humidifier to work?.. It certainly needs to breath to run the engine.
I stitch up little cotton bags full of Silica Gel and keep them in my tool box and anywhere else, where stuff might tend to go rusty.
Silica Gel attracts and absorbs moisture. Maybe a bag of that in the tank on a string, once you can get rid of the petrol.
Don't know if it would work, but it might help?
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