My son found the fuel tank cap on the diesel transfer tank. I last filled prior to 3 days of rain. I have not run it since before the rain. So besides kicking myself for being an idiot, what actions can I take to avoid troubles? Drain fuel tank? If i do, what do i do with the contaminated fuel? Any additive or treatment I can use? Thinking running it and draining water trap is not a great idea. I'll accept all flaming insults as punishment. I deserve it. Thanks.