Mazda Repair Questions? Ask Mechanics for Answers ASAP
sorry to say that there's no drain tap on the tank and the usual method is to use a remote electric pump to suck it out via the filler neck
as most cars these days have an anti- siphon valve so you can no longer just use a length of hose
alternatively if you remove the back seat cushion and then remove the access panel above the tank you can then remove the tank access panel and siphon out from there
what you may want to consider is the hire of one of the specialist firms that will come to you, and clear out the tank, dispose of the contaminated fuel and fill you back up with regular fuel to get you on your way
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