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fuel pressure regulators are normally located in the fuel manifold. They are either vacuum controlled or electronic controlled to maintain the right fuel pressure for engine requirements and to shut off the fuel pump when the ignition is turned off
If your manually adjusted unit will not do all that then you are asking for fault codes to appear and all sorts of problems to occur
When the fuel pump was replaced it is important that you install a new fuel filter as it is necessary to have a clean filtered fuel into the pump. Also check the injectors and the spark plugs.
If the spark intensity is low check the HT COILS and the ignition system triggers to the HT coils.
If spark is good then the fuel pressure and calibration must solve the issue.
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