Fuel line for NX fuel pump

[Reimond]

can i just make T-connection before fuel rail to feed NX fuel pump? Don't really like idea to drill more holes on fueltank

Sled is 06 attak

 

[kinger]

I don't think so because the FI system is probably under 40psi and its all hard lined I beleive. Check with Nos-pro where to tap fuel. No need to drill into tank I know that.

 

[Blown14psi]

I Didn't like the idea of drilling the tank also, but there is no other way. The fuel rails are under high pressure and there is no other fuel line available.

The NX pump runs at 4-5 psi. I used a bulkhead fitting with a rubber washer and it has held up fine with no leaks on 2 sleds.

I would rather use an external seperate fuel tank and CB has one that fit's in the nose of the Apex/Attack, but that is where I mounted the bottle and there is no room under the "Hood" for a seperate tank.

Another thought is Teeing into the high pressure line going to the rail and forgoing the fuel pump altogether, but then you would need a .010 fuel jet for 60fwhp and that's too small. Too great of a chance that it may get clogged and burn down your engine.

 

[NOS-PRO]

The fuel line pressure on the fuel injected Apex/Attak is about 39 psi when not running, and ranges from 34-37 when running. We splice into the hard line with a brass compression "T", and the side nipple is small with 1/8 inch fueline.

The jet should bring down fuel flow no matter what pressure you have behind it, just wondering why you would need to go smaller, unless they recommend for that system???

 

[Blown14psi]

NOS-PRO your going to get a lot more fuel out of a .010 jet running at 35 psi than you are running it at 5psi which is what the NX and N.O.S. pumps run, so if you jet the nozzles according to NX recommendations then you will be using a .018 jet for 40hp and if you use that jet at 35psi then you'll be way too rich. The smallest jet you can buy is a .010 and that is also too large to run for 40hp at 35psi, but it will work for 50hp.

 

[NOS-PRO]

Gotcha, didn't think it would change that much. SO what size jet would you need? .008?

 

[Blown14psi]

A .016 N2O jet with a .09 fuel jet AT 35PSI will give you 46.25 Crank HP, so to be safe I would run a .010.

A .018 N2O with a .011 fuel jet at 35 psi will give you 58.53 crank hp.

But at 5psi you would need a .016 and a .018 to get the same amount of fuel or .007 larger jet.

Here is a simple online jet calculator.

http://www.coldfusionnitrous.com/calculator.html


At the time I did my install I toyed with the idea of teeing into the pressure line ,they do it on cars all the time, but after talking with the N2O guru Mike at NX, he didn't recommend it because, during their testing on EFI streetbikes, the stock fuel system couldn't support much more than stock HP. So they include fuel pumps on all of their powersport kits.

But I know that their are a lot of boosted sleds running high hp on the stock fuel system. So I think it's safe to say that you would be fine

 

[HAMMER]

I've got a question...since I've never had my seat off...I haven't looked at the in-tank fuel pump setup...is pump line fitting external and easy to get to off the tank ??? My intention was to replace the factory hard line with rubber EFI hose and to run an auxiliary pump in parallel to increase the fuel pressure when I'm on the bottle. I've got all the parts ready just haven't got up the motivation to dig in yet.

Fuel Upgrade Thread
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http://www.ty4stroke.com/viewtopic.php?t=44914
---------

 

[NOS-PRO]

I've got a question...since I've never had my seat off...I haven't looked at the in-tank fuel pump setup...is pump line fitting external and easy to get to off the tank ??? My intention was to replace the factory hard line with rubber EFI hose and to run an auxiliary pump in parallel to increase the fuel pressure when I'm on the bottle. I've got all the parts ready just haven't got up the motivation to dig in yet.

Fuel Upgrade Thread
---------
http://www.ty4stroke.com/viewtopic.php?t=44914
---------

Easy to get at when the seat is off, but the fuel line has a special clip on the fuel line for the tank and the fuel rail. Looks similar to a boat tank fuel fitting.

 

[NOS-PRO]

A .016 N2O jet with a .09 fuel jet AT 35PSI will give you 46.25 Crank HP, so to be safe I would run a .010.

A .018 N2O with a .011 fuel jet at 35 psi will give you 58.53 crank hp.

But at 5psi you would need a .016 and a .018 to get the same amount of fuel or .007 larger jet.

Here is a simple online jet calculator.

http://www.coldfusionnitrous.com/calculator.html


At the time I did my install I toyed with the idea of teeing into the pressure line ,they do it on cars all the time, but after talking with the N2O guru Mike at NX, he didn't recommend it because, during their testing on EFI streetbikes, the stock fuel system couldn't support much more than stock HP. So they include fuel pumps on all of their powersport kits.

But I know that their are a lot of boosted sleds running high hp on the stock fuel system. So I think it's safe to say that you would be fine

pretty cool calculater, and see where the change is. Thanks for posting that Blown14psi.

 

[HAMMER]

Easy to get at when the seat is off, but the fuel line has a special clip on the fuel line for the tank and the fuel rail. Looks similar to a boat tank fuel fitting.

Great...so I can just pull the hard line all together and clamp the rubber EFI line in it's place. I've had the fuel rail line off and the rubber EFI line I bought fits perfect over it.

 

[kinger]

That will work Hammer but knowing you i thought you would have a metal "T" brazed in the hard line or something.

 

[HAMMER]

Stainless will have to do....

 

[kinger]

Stainless what, hose clamps?

 

[HAMMER]

Stainless "Y" connectors
Stainless Check-Valve
Gates Powergrip SB Clamps (heat shrink type)
Stainless Safety Wire (under Gates clamp)

Single Wrap 180* Method
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http://www.clamptitetools.com/Instructions.html
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