If it was me I would buy all fixed say like one each 4,5,6 psi check valve try them all out and see which one runs the best I also would not exceed the actual fuel return line size of 1/4 inch just to make sure. Adjustable just means more moving parts too "FAIL" just like IFS 4x4 vs Solid axle. more moving parts, more chances to break which = WEAKER and More Expensive.
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