Nitrous safety switch problems

[donpearsall]

I have installed a Nitrous system on my carbureted Suzuki GS1000 motorcycle. To make sure it did not work unless there is enough fuel pressure I wired in a fuel pressure safety switch. So far when testing the system, the fuel solenoid was "Chattering" meaning the switch is turning the fuel solenoid on and then off very rapidly - like a several times a second. The idea is that the solenoid should turn on when the pressure is low and then turn off when the pressure it is at a high limit.

All three of the switches chatter. The only switch adjustment is to set the ideal fuel pressure which is about 8 PSI for the injectors I use. Aren't they supposed to flow steadily? What brand/model of switch have you found that works? Or is this normal?

Thanks
Don

[Rex Schimmer]

Don,
Looks to me like you have a case of the switch and your pressure regulator "talking to each other" try lowering the switch setting to something below what ever you fuel pressure regulator setting is. It will still work if you lose fuel pressure but it should stop the chatter.
Rex

[Stainless1]

Don, is your fuel pressure steady?  Or is it dropping when the solenoid opens and rising when it closes... trying to regulate fuel pressure with solenoids will not work... a fuel pressure regulator needs to be in the feed line.  To set the pressure it must be flowing so make an AN plug that fits into the feed line with an orifice equal to the total size of your gas jets.  Adjust the pressure regulator to the feed rate the delivers the correct PPH of fuel. 
Yes you need steady fuel pressure... what you really want to do is put a murphy switch on the fuel that won't let the N20 come on unless you have fuel... it might bog a little if your RPM's aren't up, but it will save parts if the fuel is not there.  Hopefully you are using a standalone system for the N20 that is isolated from the fuel for the motor. 

[donpearsall]

Thanks for the replies. The fuel pump is internally regulated to 8 PSI. That can't be changed. That is the recommended pump from Nitrous Express because I am using all their parts.

The fuel and N2O lines are separate from each other until they get mixed in the nozzle screwed into the carburetor. From what I see, it is a standard system used by many cars and bikes.

Don