If I'm not mistaken, the gas cap on 1930-70s chevy trucks is a one way vent.
Allows air in but not out.
So if the system is properly sealed then hot gas will build vapor pressure in a parked truck.
With enough pressure this could force gas past the float bowl valve and cause flooding on startup.
Does anyone notice this problem?
Or is there a positive vent somewhere? (there doesn't appear to be any on my '59)
Also, gas tanks aren't designed to withstand much positive pressure... seems like a giant design flaw unless I'm missing something?
Last edited by Ott3r; 02/18/2020 1:04 AM.
