I recently got a nitrous kit and installed it yesterday. Upon testing I found out that only the nitrous solenoid was working. The fuel solenoid does not click like the nitrous one did. I tried switching the wires around to see if that was the issue and still nothing. Basically everything is wired correctly except potentially that one fuel solenoid. According to the diagram you splice the power and ground of the fuel to the nitrous then connect them to there corresponding spots and obviously if the nitrous one is clicking then I wired it correctly. So if anyone has any experience with this or any troubleshooting ideas the help would be greatly appreciated.