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Is 4 or 5 psi less fuel pressure enough to cause a po171 code

(2002 Buick LeSabre)
in Binghamton, NY on September 15, 2013
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
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Popular Answer
on September 15, 2013
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
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