Im wondering if my fuel line is big enough. I have a SBC heavily built stroker with a 800 holley. It also has a NOS sportsman fogger jetted for about 300 HP. Im feeding all this with a holley electric fuel pump through a 3/8 fuel line. So my question is what size fuel line is everybody else running? Do you think 3/8 is large enough? I just put all this together only sprayed it once in 3rd gear for a second as a test.

 

When in doubt, go bigger... especially with nitrous.

 

Your setup is plenty for the engine side of things. I would consider a secondary fuel system for the nitrous or swaping to a efi style fuel pump with a return style regulator though.

 

I have regulators and Pressure gauges on both the carb and the nitrous. Im just a little concerned about getting lean at WOT while spraying.... Is anyone on here running a simalar setup?

 

What pump are you running? Reason for asking is I don't trust a deadhead style system to provide that much fuel. If you are going to go that route anyway, step up to a b/g or magnaflow style pump and run a 10an line to the front with a y-block to your current regulators. BTW, I currently run a Paxton1100(same as the aeromotive A1000) with a mallory bypass regulator(10an feed, 8an return) for the engine side of things.(504fwhp) And a 1gallon fuel cell with a Holley black pump and deadhead regulator for a 225hp plate system.

 

-10AN thats 1/2 " isnt it? My pump is a holley electric pump.. I cant remember the model # but its huge. I have it run through a filter to the front of the car to a Y block one side For the nitrous regulator the other to the carb regulator. But if your running all that through one -10an that makes me feel alot better.
Thanks

 

I would think a single 1/2 line would be minimum. I run 3/8" line up to 550HP without any pressure drop-off, but if you're up in the 700+ range, then I would be very nervous about a single 3/8" line.

It's not the steady-state demand that gets you. It's the hard acceleration through the lower gears. You can keep up with fuel demands on a stationary dyno without anything special as far as the fuel system goes, but when you get it in the car and have to deal with the hard acceleration that a 700+ HP engine can generate that's when you start outrunning the fuel system.

As was suggested, above, it would probably be a very good idea to run a completely separate fuel system for the nitrous.

 

I had thought about that before(secondary fuel system). I was just curious what everyone else was doing. I have everything but the pump, so I guess I will buy another pump and just run another fuel line. I may use the existing 3/8 for Nitrous and use 1/2 for carb.
Thanks for the help!

 

A -10AN line is a reference to the outside diam. So depending on the line type you will probably have some where between 1/2" to 9/16" inside diam.
These are giving in 1/16th of an inch. So a -10 is 10/16" or 5/8", a -4 would be 4/16" or 1/4" O.D.