Congealed gas in tank... what to do?

I have a tank I pulled out of a '65 Ford F-100 which is about 1/2 full of molassess-y gas. What is the best way to get that sludge out so I can use the tank?

 

Wash it out with water and then make your own solution of lie and water to let it soak for a few days.

 

That's right. Lye and water, hot as you can get it.
A radiator shop will use the same thing. ('Hot Tank'...lye & hot water)

 

Before you make a huge mess,check the outside bottom of tank real close for pinholes/rust.Tap on with a small hammer.I've cleaned out tanks like mentioned above and then found it was scrap.Now you got two piles of shit

 

Cool beans... I think I will go to the car wash tonight and see what I can get done...

 

Don't do it when the owner/manager is there. No need to ask why I know that tidbit but at least I don't live in that town anymore.