which means you have 8 PSI going out both sides...which is fine if both are plumbed to a carburetor
in your case, one is plumbed to a carburetor, the other to an open line
the fuel will take the path of least resistance, which is right back into the tank
try this, just for fun, take the return line off and plug the hole
my guess is you will see more then 8 PSI at the carbs
the way to fix this, is to put a restriction in the return line, like some of the stock hemi filters had...i think it is a 30 thousands hole
