Re: '32 901 Sedan - Vapor Lock

Posted by Marty or Marston On 2023/9/12 19:33:03

My fuel bowl (glass) is on the inlet side of the fuel pump. During this episode of vapor lock the fuel bowl was always full of gas. I knocked on the side of the carburetor in case the float needle was stuck in the closed position

I believe the BP article was back when lead was added to prevent knocking. New grades do not have this anti-knock preventive in them.

Since gasoline is a made up of hundred of compounds, it does not a a boiling point as such. It has a point at which lower boiling compounds transition from liquid to vapor and begin to distill off. It is these compounds that cause knocking in carbureted engines that makes knocking. I think premium has less of the the more volatile components. It would be these volatile fractions in regular gas that would contribute to the formation of vapors.