Your best bet is to drop the tank and then dump out the water.
Dropping the tank isn't that big of deal.
Remove the filler hose and a couple vacuum hoses. Unplug the main fue pump harness. Remove the fuel lines. Support the tank with an appropriate jack. Remove the straps and drop the tank.
I’m happy to assist further over the phone at
https://www.6ya.com/expert/jeremy_d728a59f986299fa
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