Let us talk about the new gas. Ethanol. Owning an inboard/outboard 5.7 chebby, and being in boat forums for years: Any ethanol eats up old hoses, gums up in the tank, absorbs moisture, pings like hell (only mech advance in a boat, and the old high compression.). Won't store over the winter, unless you go broke on seafoam. More filters. Pulled 40 gallons out of my tank last month, shined a light in it; gunk on the bottom.(pulled and cleaned shiny 2 years ago). There is no way that any company that mixes ethanol in gas (gov mandated), can say with a straight face, that their gas is good.
And put that crap in my 70 Duster, advertised 10.5? NO.
Flushing my new fuel cell and braided lines; 10 gallons Forced through it seemed to clean the debris out. Clear gas. I let it sit a week, and put a glass filter on, to start it. Gas had turned red, and had tiny bits of black(fuel line) in it.
I never have seen this until 10% ethanol.