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The purolator maintains pressure ok but its very restrictive for fuel flow. Fine for a DD stocker, questionable for a performance carb. I have had holley regs on my streetcar and racecar with no problems other than one ruptured diaphragm (easy fix). The holleys are cheap, simple and reliable IMHO. Are you guys deadheading? I was running the stock return line on both cars, not that it should matter. Maybe you dont have the spring correctly seated in the reg?
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