I swapped from TPI to carb, I'm using the stock in tank TPI pump with the Mallory regulator. I also have a NOS 125 powershot kit, and I need to supply fuel to it. I was thinking I have 2 choices at the moment, either y off the line that is feeding the carb, or could I open one of the currently blocked ports on the regulator and run a fuel line off it to the fuel solinoid on the nitrous kit?

Thanks

 

I have the same setup and thought about adding a N20 kit also.

I beleive it will work, but I would rather here from guys that have done it.

You could always mount a small fuel cell under the hood and run a dedicated fuel pump to it. I have seen guys at the track run it this way.

 

run a new 3/8"line from the gas tank (or use a under hood mounted cell) to the nitrous.
use a Carter #4594 pump. use a holley 12-803

regulator. When you get bored with the powershot you'll be all set for a Cheater system.

 

i just got a NOS system and i was wondering the same thing. what i planned to do was open up one of the blocked ports on my mallory fuel pressure reg and run it to the Nos like you said. does anyone see a problem in doing this?

 

if you have a fuel pressure safety switch in the line for the fuel to the nitrous solenoid then you'll be fine, if you have a fuel pressure guage and it drops below 5 psi then your nitrous will shut off. Personally i'd run a 3/8" line from the tank and put in a walbro 255lph pump at least. To give you an idea of how wild my setup is, the smallest line on my car is 1/2" line. My fuel pressure never drops below 7psi for the carb and 6psi for the nitrous off its own fuel pump.

 

There is no reason you can't open up another port on the Mallory and run that to the fuel solenoid on your nitrous system. If you've got enough pump to keep up with the fuel needs of the motor on nitrous it will work fine.

Running lean on nitrous is always bad. A fuel pressure shut-off on the system is always a good idea no matter how you have it plumbed up. A flaky electrical connection or bad pump could cause you to run lean no matter how big your lines or how many you have.

I have run a single 3/8" fuel line (stock feed line size on a 3rd gen) with an electric pump well past 500HP with a carb and nitrous. The single feed line isn't the restriction at that point. If anything is the restriction it's the pump's capacity. And an EFI pump that's designed to move fuel at 40+ PSI can move a TON of fuel down at only the 6 PSI that a carb requires. Make no mistake- flowing enough fuel for an EFI motor @ 500HP takes one heluva pump. Doing the same thing at 6 PSI isn nothing special. The volume required in both cases is the same but the difference in required fuel pressure takes a lot of strain off the pump in a carb application.

 

that is exactly what i wanted to hear thank you very much. that helps me alot.

now if im going to open up another port on the fpr to run to the fuel solinoid, i want to run a fuel filter, a fuel pressure gauge and the nos fuel pressure safety switch. so in what order should i put those inline from the fpr to the nitrous? im thinking im going to put the fuel filter first then safety switch then the gauge how does that sound?

 

Just make the fuel pressure safety switch the last thing it hits before the solenoid.

 

If it makes you feel better this is the exact set up I use,except I do have a 255 pump.I do run a 150 shot with no problems so far,I just keep a close eye on FP.I dont feel comfy enough to go any higher than a 150 shot.Even though I have the 255LPH pump regulated down to 8-9 psi it still is only around 80 GPH,volume is important with carbs not the psi.I will be switching over to a Aeromotive 140 GPH pump soon ,or just doing a dedicated fuel cell/FuelPump for just the NOS.So yep,you should be good to go!Good luck.

 

hey thanks man i appreciate it. i thought it was going to be a big deal to add the nitrous and i thought i would have to add a fuel cell and pump but im glad i found this thread, thanks again guys!

 

i also have a mallory return style regulator with a port open to the carb and one to the fuel sol., works great

 

i want to do this the same ways, whats the part number on the regulator you guys are using?, thanks

 

650-4309 in jegs