The video did not undo my knowledge of gasoline
Bill Tindall, E.Tn.
"To my surprise the real culprit in pump gas that causes problems with small engine carburetors is not the ethanol but the benzene. That's what's responsible for drying up seals, diaphragms, and gaskets."
I have no patience for people that are earning a living off the internet lecturing on topics they know nothing about, chemistry for example. These snake oil salesmen are not harmless.
If you find someone with even a rudimentary knowledge of gasoline composition that agrees with this statement I will withdraw my criticism and apologize for claiming this person doesn't know anything about the topic he is lecturing.
I will extend the promise to the following if you can find anyone knowledgeable that disagrees with these facts:
1. Gasoline is required by Federal regulation to have a benzene content of less than 0.6%.
2. Gasoline contains about 20-50% aromatic chemicals including this piddly 0.6 or less % benzene.
3. For the purposes of affecting seals there will be no difference among these 20-50% aromatics and the 0.6% benzene. Its presence is insignificant.
Gasoline has had a 20-50% aromatic content to achieve octane ever since lead was removed, with a higher benzene limit before 2011. Who could imagine that engine manufacturers haven't accommodated this fact with appropriate materials.
The unexpected step change was the addition of ethanol that for a short time caused seal and hose degradation until new materials were implemented.