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is 4 or 5 psi less fuel pressure enough to cause a po171 code on 2002 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
checked fuel pressure,only at 44 psi so I changed fuel pressure regulator. now it's at 50 psi. my car calls for 53-59 psi. only regulator I could find is rated for 50 psi. is this difference enough to cause a po171 code
(1) Answer
yes it doesnt take much of a fuel pressure drop to cause problems if it still not running right then clamp off the return line and see if the pressure goes up