Guys, Looks like we are in a nightmare with fuel induced problems. The equipment is not designed for 15% ethanol blends. Might be the reason I had two new vacuum Oregon to fail. Their check valves were severely damaged. Had to drain the customer's tank and install my known 10% ethanol fuel.
https://abcnews.go.com/Business/wireStory/epa-allows-gasoline-higher-ethanol-blend-summer-98941507
Also be aware the 10% ethanol warranties will be void and null. So I think we are going to see a lot of mad customers. Stay Safe if you can.