Best way to clean old fuel tanks
 

What's the best way to clean saddle tanks without having to remove them. Got a boat that's been sitting for a while and I want to make sure I don't suck up any garbage when I fire it up. Thanks

I was looking at getting my tank cleaned last year. Look for a local commercial tank cleaning place that does semi tankers etc.

It was going to be about 70 bucks to get my tank completely professionally cleaned.

The cheapest way with sometimes fair to great results is filling them up with straight ethanol E 98. Next good cleaner is acetone but it can get expensive using that product. Acetone works very well.

Do not fill your gas tanks 100 % with the cleaner - you want to hook your boat / trailer up and drive it around to make a washing machine effect cleaning the inside of your fuel tanks.

A simple lit match... Kidding aside. Very hot soapy water and a 12V pump with a rubber impeller. Flush 2 or 3 times pump out and completely drain after each filling. methyl hydrate rinse and drain. Good to go...