I'll try to supply some additional information that might be useful. All of the fuel lines are metal with flared fittings. There aren't any rubber hoses with metal clamps involved. I haven't noticed any leaking gasoline. The boiling (what I've been calling percolating) fuel vapor bubble moves from the carb bowl back into the glass bowl filter when the engine is at operating temperature and then gradually diminishes as the engine cools and the filter bowl refills with fuel. I haven't ever noticed a sign of air entering the filter from the inlet (pump) side. That 6 psi fuel pump pressure that I measured a couple of years ago was with a cold engine.
This high-altitude, winter-blend gasoline percolation is consistent with my other trucks with 235 engines and Rochester carbs.
As far as boiling out the tank goes, I do have a good radiator shop that I use. That would be part of the cost equation in a comparison of refurbishing the stock tank vs. buying a new repro.
If I left some needed information out of my answer, please ask again. I appreciate the interest and advice from all of you guys!
1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup
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