Requires 2.5 - 3 lbs of fuel pressure, see regulator kit part# 1035056Factory fuel line from mechanical pump is roughly 1/16" smaller than WeberRegulator/Carb fuel line. Slight pressure is all that is needed to fit the smaller line.We at LC Engineering were never happy
with the fitment of Weber's 2-piece adapter for carburetors, so after
years of continuous testing on racing and off-road applications, LCE
came up with a better design that actually improves horsepower because
of its spiral design. Engineered and made in the U.S.A.