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I use a Cobb tune, that allows me to log the fuel pressure requested and the fuel pressure supplied. When I would start the car, after sitting for a day or two, it would take several seconds for the NPFP to start building pressure. At the end it would require that I start the car several times before it would build pressure. It would also not be able to meet the pressure requested at high boost at higher RPM, sometimes it was 1,000psi below requested. If you have a way to monitor your rail pressure, you can see it failing.
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