Dimis Have to remember I was going with super charger and 10 psi of boost. With just the motor and 55 pound injectors, idle WITHOUT the vacuum con trolled regulator on is 44-46 psi. With the regulator running it drops into 36-38 psi. This is at 750 rpms. Sorry I don't have the cycle % off the top of my head. I started with a 452 motor and now run a 482 stroker. The setup was about the same. The amount of fuel dumped is alot and I run FI motors soft on A/F ratios with racing. At WOT my duty cycle is only 68% with 46 psi on the rails. I have 2 Walbro 255 litre pumps in the tank with 2 supply lines and anti reverse flow valves. 1/2" supply to a V block and goes to a #12 line to the rails. Return is #8 back to the tank. This is way over kill. One pump of 255 in the tank with a #10 line supply and #6 back to tank will do a fine job. i am not a fan of deadhead fuel rails. Over time small partials get to the injector on the end of the lines and you start to have problems with injector flow and spray patterns. Trade off is than after 20 minutes of track time my fuel is warm. Again 2 pumps working. Find somone WHO really knows how to setup an FI system and you will be fine. I leave about 15 pounds of tork and 22-25 HP with running a soft A/F ratio and timing. Motor will last for years. Clean the plugs is cheap after racing. Sand bead and regap. They are lite black which could also be a little
oil from the PCV valve or flooded valve train. Both sides are the same color. Good luck Rick.