Vapor lock- additive?

Syleng1 said

if you have experienced vapor lock -adding a return line and a 3 nipple filter may be the way - thanks to UTG and DDG for that info…

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Would This solution bleed off half of your available pressure tho? it seems that just maybe your 5-6psi mechanical pump wouldn't be able to put 5 psi to your carb anymore w/ a return line.
Is This a thing?