I am in the category of no visible "bubbles" in my fuel system, there has been a time that I thought I had "vapor lock", but it went away after I adjusted the points, although my car is near stock it has modified itself to give more carb heat to better vaporize fuel, and to compensate it has added more bowl vents in the form of a torn carb gasket ---with winter gas on a 95 degree day, long parade--idle speed for 1 hour ---then perhaps it is a little slow to get up to speed for a few seconds --then normal, the crack has exhaust blowing directly on the carb--you can feel it, i don't know what the carb temp is but you sure can't hold your hand on it.
the fuel pipe has had the burr removed from the end where the pipe was cut, the screens are original ,jets,float valve,float also original---cast iron sediment bowl (prove that it has a bubble in it)---nothing to worry about, no bubbles to see --therefor no problem
Yes I probably have gas boiling in the carb sometimes, but the car drives through it.
Have you tried having everything stock with original ford parts ---no modifications ???
I built the car stock, very few modifications ( B cam, diode cutout, Quartz Halogen headlight bulbs), since then it has thrived on neglect and been very reliable--other than for the halogen headlight bulbs it's the same as it got the blue ribbon in the 80s
have you tried the original fuel line routing using steel pipe, no low spots, gentle slope in horizontal runs ---no inline filter ( it is interesting, am working on a BMW Isetta the parts place for them warned me that I should never use a paper filter, that it would cause "vapor lock", this car also has a gravity system.) ---the stock screens won't pass anything large enough to easily clog a jet, too fine of a filter can restrict flow.
