Could I get some help with the correct tune parameters for my particular situation? I changed from a returnless style fuel system to return style fuel system and I've kept the Fuel Rail Pressure Sensor (FRPS) and the Fuel Pump Driver Module (FPDM). The FPDM is wired to an after market relay, which is wired to the fuel pump. This allows pump priming for a few seconds as it occurs in OEM conditions with key on, engine off. I was able to confirm the setup works prior to making changes to the tune. I do have an after market regulator. The base pressure has been set to 40 PSI. Also, this is for a supercharger application with about 15psi of boost. I am not a tuner so I gathered the information noted below and passed it along to a tuner, whom wasn't familiar with keeping the FPRS and FPDM in a return style system. He prepared a tune accordingly. As soon as I turned the key on/engine off, I noticed the pump was not priming anymore. Obviously the car didn't start after cranking. Below is the information I collected from various sources to provide to my tuner. Could someone help me understand what is missing or wrong here?