1) If the NOS pump goes in line with the stock pump does it really serve a purpose seeing how it is only adding pressure to what the stock pump is giving it. ( basically adding pressure not volume) assuming volume is what is the important part.
( bassically the nos pump is only helping the stock pump because it cant outflow what it isnt being fed from the original pump)

2) ON a wet system that taps into the fuel rail from the schrader isnt it feasible that the rails will not hold the volume to sustain ample fuel once the nos starts drawing from the same >uhh< well, for lack of a better term. (Fuel rail for those with less imagination.)
( basically you only have to fuel rails worth of on demand fuel and now far and above what the injectors are already calling for your nos wants feed from the same area, technically feeding 9 hungry mouths instead of 8)

3) has anyone switched to a holley 255 and had any concerns that I should be aware of ???

4) would it be worth the effort to, while changing the stock fuel pump for the above mentioned to
a) take the NOS pump out of line with the stock set-up and put it
back to original configuration
b) tap a 4AN fitting with pick up tube into the pump housing
(the little plate thing everything hangs from) using a bulk
head type 90 degree conector, then using stainless brake line
make a pick up tube, run the other end out the plate and
connect it to another stock type filter .
>whew< taking a deep breath,
Then........run the filter output line to the pump then to the
Fuel solenoid
This being actually an easy to make totally independant NOS feed hose complete with filter prior to pump and solenoid ???
This also allowing your NOS pump to not be running all the time or be on demand controlled by a switch

Sound like to much head ache or am I on target ??

 

Your stock fuel lines and rails are good to about 600hp or so. You'd have to tell us how much power you're trying to suck through them for the poll to be valid...

Dave

 

The poll is absolutely valid without that info, while I am in there is it worth doing the work in one shot as opposed to it coming up again later and having to redrop the tank.

As far as how many ponies >shrug< I dunno never had it dynoed, but on the Flawed 600 HP more or less, fuel rail idea lets say 275 stock now with CC306 and heads rough estimate 350, shoot a 150 shot and your jetting awful close to 600, especially when 1 volt worth to the pump makes such a dramatic change in the pump output. The car does a 13.2 in the 1/4 at 108-110'ish without the nitrous, with the 150 shot on in the upper RPMS my performance drops off dramatically as compared to the 75 shot.

Fuel related mods I have heads run a CC306 have a stock throttle body, have an inline nos pump, that I still dont understand what purpose it serves, and a AFPR, 24 lb injectors as opposed to 22's and a recal'd Chip. I run my Fuel Press. at about 52.

 

sounds like too much trouble then it is worth.
rskrause made 700+hp with a 255 in tank boost-a-pump and stock lines/rails.

Also if you were to run the NOS pump for a dedicated feed,you would need a regulator to keep that pressure in check.

The only way the rails wouldnt hold enough fuel is if you have the injectors MAXED out and a very weak fuel pump.

 

That sounds way too complicated to me. As was stated, I have been using a single Bosch 255lph intank, stock lines, rails, and regulator and getting 733+rwhp with the aid of the Boost-a-Pump. So, that's a simple system that should work for 99% of the modded vehicles out there. I am upping the power this year and am going to make some upgrades to the fuel system, but I am not really sure that this is needed even now!

FWIW, I am planning on sumping the tank and using a large external pump, larger feed line, and maybe some larger fuel rails and an upgraded regulator. But unless you want more than 700rwhp, you truly don't need something this exotic.

As far as inline pumps go, they are most useful in a blower application to move the fuel delivery curve to the left - IOW to allow fuel delivery to be maintained at elevated pressures. You are right: the volume will not exceed what the stock pump would flow. But it does decrease the pressure the intank sees, so the flow will increase to a point at lower pressures. But if you are using a good intank (I am not familiar with the Holley) at stock pressures, the inline will be a potential restriction and should be left out.


Rich Krause

 

Thanks guys thats is a much more educated response