1946 2Ton with 235 all stock original. I've had this truck for 15 years or so and have always run regular pump gas, which for some time here has been E-10. No issues. If I shut her down hot I'd notice some mild boiling of fuel in the glass bowl but it would only go down half way or so and then quit -- truck restarted hot reasonably so long as I held the throttle 1/4 open or so and did not pump the accelerator at all. Then came this summer -- bowl will boil all the way dry and even when running (and hot) the fuel pump will only sputter fuel into the bowl and keep it, maybe, 1/4 full at idle. She'll starve for fuel at prolonged red lights and she never did that before. I swapped the fuel pump out for a spare but no real improvement. Pulled the flex line off the bottom of the fuel tank and looked down the inside -- all OK there. put it back on and opened the petcock and fuel runs freely so that's good. Blew out steel line from tank/flex line to pump and that's OK.

1) Seems like the boiling point of the fuel is just low. Maybe I got a load of fuel with higher than spec ethanol?
2) I hear a lot of problems with bad out of the box fuel pumps. Thoughts in my case?

I'm reluctant to add insulation around lines, etc. as I'm an originalist -- also the truck did fine for years and nothing regarding the physical setup has changed. The only non-ethanol fuel available here is also high-octane (93 - 95) Is that any better from a boiling point perspective? OK to run in an old 235?

Thanks in advance?

Pete P.
Harborcreek, Penna.