Fuel Vaporization Using Eddy Carb -- In-Line Fuel Pump Question

Lets focus on the problem.

Forget about the inline fuel pump. It's a band aid and wont solve your vapor lock issue.

You need to vent that line which will release the vapor pressure and allow the fuel to flow to the carb which in turn will fill your fuel bowl and thus allow fuel to be pumped to the engine via the carb. Even when it's hot the venting of the vapor continues to allow the fuel to flow. Most VL issues can be solved with the simple mod mentioned above by several people including myself. Having a heat sink on the manifold like a wood or poly spacer plate will also help but venting is the #1 priority here.

If you must install an electric pump then do it properly following the manufacturers installation instuctions. As stated elsewhere in this thread there are many manufacturers and all of them have websites that have instructions you can review before you spend a dime. Below the fuel tank and as close to the tank is the basic rule for location btw.

More homework and less guesswork will solve most of your problems.

Good luck with your project.