[bigblockcoupe]

if the bottle pressure is low you can only raise it by heating the bottle. to see if you are getting nitrous to the intake with the car off just disconnect the nitrous line from the nozzle and turn all the switches on then hold the line away from yourself or anything else and engage the throttle wide open by hand if it sprays it is probably a fuel delivery problem so i would start checking the vacuum lines to the fuel pressure switch and electrical connections to the second solenoid.