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rotorwrench · 07-22-2023, 08:52 AM

It's actually not the ethanol that is hard on the lead/tin/antimony OEM tank lining but the moisture that is absorbed by the ethanol. That stuff will form into a fuzzy ball that rolls around on the bottom of the tank and eventually becomes acidic over time.

Most of the old tanks likely don't have a lot of terne plate left in them by now.

Nitrile rubber (Buna-N) can hold up OK to modern fuel but fluorocarbon (Viton) or fluorosilicone elastomer is better. Most stuff was generally Nitrile rubber for many years but with a lot of off shore manufacturing, it's hard to say what type it might be now.

07-22-2023, 08:52 AM	#3
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,483	Re: Ethanol It's actually not the ethanol that is hard on the lead/tin/antimony OEM tank lining but the moisture that is absorbed by the ethanol. That stuff will form into a fuzzy ball that rolls around on the bottom of the tank and eventually becomes acidic over time. Most of the old tanks likely don't have a lot of terne plate left in them by now. Nitrile rubber (Buna-N) can hold up OK to modern fuel but fluorocarbon (Viton) or fluorosilicone elastomer is better. Most stuff was generally Nitrile rubber for many years but with a lot of off shore manufacturing, it's hard to say what type it might be now.