Maybe you guys could help me out. I'm wanting to connect my return line to my venturi without the venturi becoming to much of a restriction. The plan was to T in some kind of 2-3 PSI pressure relive valve that would bleed off all other excess pressure. Only thing I don't know where to look or find a pressure relief valve that will work with gas and e85. Someone told me a residual valve??

 

Look for a check valve with 2-3 psi cracking pressure. Like somebody that sells Hilborn parts, or look at McMaster for a spring check valve.