Where does your purge line end? Is it by the windshield? If so, how far approximately is it from the purge solenoid? I'm using a 4ft #3 SS braided line to the small section of hard line. I have about 3lbs nitrous left in the bottle and I was it testing out. My purge is not very impressive. I can't see it at all. Is it because my line is too long? or is it because of the low bottle pressure?

 

Mine is about 3' from the solenoid in the rain tray. If you are not seeing fog, your pickup tube is higher than the liquid in the bottle. Pressure makes very little difference in the purge, except it blows a little higher.

 

I agree with Jime. You probably don't have enough N2O left in the bottle. Refill and try again. I'm having mine installed same place Jime mentioned, the bottom of the windshield by the wipers.