ok, im startin to get confused in my quest to hook up nitrous. I wanna run a machanical pump to a regulator, then to carb and nitrous. how is the correct way to run it? im gna get a holley 110gph pump with a summit regulator. i gotta block the tank return line, and adjust the regulator psi to 7 right?? i really need the help and advise as i am new to nos. thank u guys

Unless you'd like to be new to a broken engine, you best look into adding a dedicated fuel system using a separate electric fuel pump and separate fuel line from tank to nitrous plate to feed the nitrous system.
Tapping into the engines' fuel supply (especially with a mechanical pump) is a sure way to get into trouble.
Until you get this figured out, stay off the button.

my buddies dad runs off the stock fuel supply, and upgraded mechanical pump. he hasnt ran into any problems. not gna use the button only at track, and maybe 2 test and tune. not gna be strictly nitrous

It does not matter if you'll only be using it occasionally. If/when the system goes lean, the motor will get damaged.
If your buddies Dad jumped off a cliff, do you have to follow?

Nitrous requires a constant steady fuel pressure. A mechanical pump cannot deliver a steady fuel pressure like a electric pump can.
A carburator is a different beast. It can tolerate a pressure variation as long as the fuel bowl is recieving enough fuel to keep the jets covered.
When at WOT a carbed motor will often only see say 3.5# fuel pressure at the last few hundred feet of a 1/4 mile run (with a mech pump).
This 3.5#'s fuel pressure will casue the nitrous side to go severly lean.
Most nitrous sytems are calibrated for 5 to 6psi and require a steady 5psi minimum. A mechanical pump will not deliver a rock steady fuel pressure under all conditions. There is way too much pressure variations with a mechanical pump system.
If you want to run nitrous (even for just a few time trials), then do it right.
It only takes once to wreck the motor.



I have 30 years experience installing, tuning and racing with nitrous. And correcting others messed up systems when they got "confused".
What nitrous system specificly are you looking to install?


This is the minimum fuel system upgrade required for a 150hp shot:
This is a easy and afforable add on upgrade to your present fuel system that will feed a 150hp nitrous system with a stable/consistant 5 to 6psi.

The add on inline electric fuel pump (Carter # P4601) need only be powered on when using the nitrous and/or running at WOT.
It can be powered off during normal driving at part throttle.
Can even be wired in thru a throttle activated switch on the carb to come on automaticly when ever you "Rug it".

These Carter pumps are much better quality then the Holley blue pump.
These are the only affordable good pump designed for 100% duty cycle (full time street use), in a dead head configuration.
A return line is not required.
This is the simplest best way to upgrade your fuel system for 150hp nitrous.

Your best choice is to: (this is 100% required if injecting more than a 150hp shot)
Install a separate fuel line, regulator and pump for the nitrous system.
It need not be expensive. But is much much cheaper to do right the first time then learn the hard way and rebuild the motor. Your friends dad won't help you when it comes unglued.
You're starting off on the wrong foot.
Consider a under hood mounted nitrous fuel cell+ simple and inexpensive dedicated elec pump+ regulator.
A proper dedicated fuel system to feed a typical plate nitrous system is not expensive or hard to install.

When this simple affordable fuel system upgrade sinks in without confusion, let me know and I'll show you how to wire it, and adjust the two separate (nitrous and carb) pressure regulators properly.

A good little read F-Bird'88. I will save this post and use this advice later on.

i respect u and ur advice, and honestly am gna go by ur word. do i gotta tap into the existing line or into the tank for the electric pump? so instead of just running it to the mechanical pump from the elect pump id just run it to the regulator then to the nitrous only? or to nitrous and carb?
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im ready my man can u pm me so i can refer to it when doing it? also if u got a step by step instructions id like that to. thank u again
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and i wanna run the nos snyper system

also am i able to just run the electric pump to a regu;ator and then off that to the carb and nitrous? http://store.summitracing.com/partde...5&autoview=sku this setup work?

Yes you could just eliminate the mechanical pump from the fuel circuit.
The electric pump mounts to the floor up over the rear axle. Up high so that the pump does not hit the axle when you go over a bump.
Goes on the drivers side of the car over the rear axle. (in front of the gas tank.)

On my car I run two Carter electric pumps back there with two 3/8" fuel lines and tank pickup tubes. 1 is for the motor ( 7psi Carter P4594)
The other has its own complete fuel line also ( Carter P4601 18psi with regulator at the nitrous plate. Will supply enoguh fuel for a combined engine and nitrous horspower of over 700 horsepower.

For your motor and 150hp nitrous system 1 Carter P4601 pump and two regulators is good enough. If you latter want to run more nitrous you will want to upgrade by adding another fuel line and pump like mine.


But by leaving the stock mechanical fuel pump in the fuel line you can drive around normally without power to the electric pump (P4601)
The stock mechanical pump will draw fuel thru the electric pump.
That choice is up to you.

The holley/summit pumps are not designed for normal street use.
They tend to crap out after a while or start to leak.
Ok for a drag car, but a pain overall for a street car.

The Carter pump is a much more durable design. The fuel actually flows thru the pump motor, cooling it. The holley/summit style pumps are not internally cooled by the flowing fuel.

ok i understand. is there an actual area u can mount the pump or is it just trial and error? also does it need to be higher then the tank or lower then the tank? i read it needs to be mounted below tank level.

When you get the car up on safely stands or on a hoist, the best place to mount the pump will be very obvious to you. You'll be drilling three mounting holes thru the floor sheet metal behind the back seat. The carter fuel pump bracket is easy to use. You can bend it to allow the pump to sit at the angle you want. You want to "rubber mount it" to reduce the vibration noise.
You can buy the carter rubber feet mounting kit or create your won rubber mount. I used fat larger rubber plumbing washers on both sides of the floor ( bracket mounting bolts) to isolate the pump and reduce the noise.

ok sounds good. also how do i run it into the line from tank? i havent looked under there is it a rubber or steel hose?

On my car (origionally V6 EFI) there are about 5 fuel lines coming from the tank.
some are vent lines, one is a EFI return line etc. I removed the tank top/sender unit and re did my in tank fuel line pick up tubes and added an extra one.
If you want to use the stock fuel lines, you'll have to determine which one of them is the fuel pump fuel line feed and which are returns and vents.
The lines are on the left (drivers) side of the car near the frame rail up over the rear axle. You'll see them when you get under there and look.
The lines are full of fuel. To drain the lines of fuel before you cut and splice in the electric pump, you can blow compressed air thru the fuel pump lines at the mechanical pump to get the fuel out of the lines. Don't get carried away. remove the gas cap first. I ran new 3/8" fuel lines on my car.

A common hi flow paper filter element 3/8" hose inline fuel filter can go inline just before the electic fuel pump to keep the dirties out of the fuel system. (This is not an option)

If your stock fuel line is old,rusted kinked, patched up or otherwise deteoriated I recomend you install new 3/8" steel tube fuel line. This is not a time to cheap out.

i have a carb motor w mechaincal pump dunno if it makes any difference. anybody with a carb use an electric pump, which lined u put it in. also my fuel lines are on the pass side.

do u run the gauge before or after the regulator for carb and nitrous?

how did u route ur fuel lines? i was under looking and it looks like a pita 2 get it the way the stock route is. did u do ur own way?