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Why not just pop the sender cover off take the sender out and pump everything out from there? You could even jack the front of it up as high as possible to make most of the water/gas run to the back of the tank. Worked great for me when I dropped the sender filter down in there and much easier than dropping the tank.
I don't think 74's have the access panel. I also don't have the coffin tank like later rigs. My pickup and sender are two separate units one at the front and one at the back.
OK here's my plan as of now. First, I will run all of the gas in the tank through a MR Funnel Filter to remove any unabsorbed water. Then in will 4 more gallons of fresh and as much methanol as is safe. This should make it runnable and alleviate the rust risk. After making some room in the top of the tank I'll add a double dose of marine formula stabil to take care of the waterlogged ethanol that I think is the root of my no run issue. Ah ethanol, the root of all evil.
Ethanol and methanol are both miscible with water and gasoline. If you have ethanol in your gas and free water the ethanol isn't the problem it's water. If there was no ethanol, you'd just have more free water on the bottom.
In Canada Mohawk gas stations used to sell an 18% blend of ethanol and methanol. Long term it caused a LOT of car fires and they were sued pretty much out of existence.
why not just run the carb/engine off of a gas can hanging from the hood and run a line from the fuel pump to out on the driveway? since the water is at the bottom, it should pump most of it out first. Then just load up with dry gas.