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Message: <blockquote data-quote="nyuk98gt" data-source="post: 398607" data-attributes="member: 8810">Tbuck07: No flame intended, I am trying to understand what is under the hood of your car. The FPR on the '97 is bolted onto the end of the fuel rail on the passenger side. Is it there on your car or has it been removed? I don't know how your car can run without a regulator. The bigger pump will flow more fuel at a given pressure than the stocker (no surprise) so the regulator needs to be in place to send the "excess" flow back to the tank (for a set pressure, say 39 psig). If the pressure at the injectors is higher than what they are designed for, then the injectors will send more fuel in for a given pulse width. At steady throttle, the PCM can adapt but the transient throttle positions (where we spend most of our time toodling around town) are going to be problematic. I don't know if the unburned fuel shortens the life of the O2 sensors or if it interferes with the readings but I bet that the MIL is going to come on with rich codes pretty soon. Chris</blockquote>