How to wire a SECOND FPSS

[Skinny]

Ok, I want two fuel pressure safety switches on my setup. One before the fuel solenoid (of course) and the other being a low pressure switch after the fuel solenoid. The reason for this second one is that if for some wild reason that the fuel solenoid doesn't open, the nitrous does not spray. I've seen this before, but not sure how the wiring goes. Here's how the typical FPSS is wired:
(We'll see how this works with the code tags)
Now, here's the only way I can think to wire the second FPSS:

The only problem I see here, is that the fuel solenoid will activate, then the fuel will fill the line, creating adequate fuel pressure, THEN the nitrous solenoid will activate. So there will be extra fuel dumped in for a moment before the nitrous will be added to the mix. Is this a bad thing?

[ March 24, 2002: Message edited by: 96BeastV6 ]</p>

[stagen]

The other problem you will run into is if you do not have a stable electrical system you will get low voltage that will effectively shut down the solenoids.

[Skinny]

Voltage isn't a problem. If it was, then any nitrous setup would have low voltage problems. The only difference in this on and a standard wet kit is 1 extra FPSS, which only provides a ground, and I don't think that draws any power.

[12secondv6]

I'm sorry but I am no help in this question.
I can't wire up anything even if my life depended on it.

[DeathBuzzz]

Being a computer enigneer, I will help out. YOur second diagram will work fine. The "lag time" that will dump more fuel in will not be enough to matter ( first you must realize that fuel is a liquid mist and N2O is a gas once it reached the atmosphere and will flow faster ( more pressure )). Of course with this setup if you have a fuel system failure you will pump extra fuel into the engine and not N2O. THIS IS MUCH BETTER THAN N2O AND NO FUEL. You should put in a LED or some way of knowing if Nitrous is flowing. If you hit the button and nitrous does not flow, stop.

~Brian

[Skinny]

Thanks DeathBuzzz. I was considering putting an LED in the the instrument panel bay that attached to the nitrous solenoid. I guess I'll do that then. [img]smile.gif[/img]