Your tank looks like a 406 fuel tank If it's in good condition i'd recomend removing the drain plug from the bottom and allowing to drain for a few seconds, then put the plug back in. the reason these tanks have the little "bowl" in the bottom of them is to allow water to sink to the bottom of them, the water can then be drained as I just described. Otherwise they eventually rot out!
I haven't seen a drain plug or bowl of any sort on the fuel tank... I'll take a look when we pick it up on Monday!