we have a 1946 chev 1/2ton pickup with a 55 235 engine. The problem is after about 30 minutues or so of running the engine the fuel system seems to be vapour locking. No fuel in the carb. Have tried several things to correct the problem, venting the fuel tank, changing the fuel pump back to an original sytle fuel pump, changing the fuel lines, but it still has the same problem. had the fuel tank cleaned and relined, but nothing we have tried has fixed the problem. checked the carb, but can't find anything wrong. Running out of ideas to what could be causing the problem. Looking for suggestions to what could be causing the problem
