I noticed a problem tonight with my fuel pressure when nitrous is on.. I went to just run the line dry of nitrous after I shut the bottle off and my fuel pressure went from 42ish to 25-30ish when I was running nitrous.. I had a 1/4 tank of gas, the vacuum line to the regulator is plugged so its max fuel pressure all the time.. Newer fuel Filter and I have a Granatelli 255 lph pump which is a few years old.. Also the voltage in the car is 10.5-11.2 volts due to the underdrive pulley.. Any ideas where to start? Thanks

 

Get the voltage back up with an overdrive pulley on the alt. Voltage that low doesn't help anything in the car.