If the fuel pump is new then the fuel pulse dampener is bad if you can’t get 42-47 psi out of it. These dampeners also restrict fuel flow and if they crack or deteriorate they will cause fuel pressure to drop. Replace it.
If the fuel pump is new then the fuel pulse dampener is bad if you can’t get 42-47 psi out of it. These dampeners also restrict fuel flow and if they crack or deteriorate they will cause fuel pressure to drop. Replace it.