Fueling & Injection - Speed inc. fuel rail fittings

I know the size is 3/8 npt, but does anyone make a NPT fitting that dosen't flare? The fittings I have come across have a .020" rise in them, which dosent allow them to screw in but half way. I'd rather my adapters screw in all the way for a nice clean finish. Does anyone know of a straight 3/8 npt to -8an male/male adapter that dosen't flare?

Its a pipe thread, its tapered on the fuel rail side too.
if it was a straight thread it would need an O ring to seal it.

I don't think the fuel rails are tapered. That's the problem. The starting thread is perfect, but a little way in, the fitting just stops because it gets to big.

Thats what makes it seal. That and some teflon tape or liquid teflon sealant.
They are not designed to thread All The Way in.

Brad

Hmmm. Well, I'm not to happy about that. Does anyone make a rail that the fittings can go all the way in? I wouldn't mind buying o-ring fittings if the would thread all the way in.

Does this really look all that bad?

http://www.horsepowerjunkies.com/gallery/data/500/345100425541.JPG

FAST has some with the O-ring fittings. I know there are others as well. I am pretty sure the price tag is higher on those BTW.

If thats what you want look around. They are made.

Brad

Aeromotive makes some
http://216.242.145.16/products/prod_imgs//img-58-1-large.jpg

'97-'04 GM LS1 Fuel Rail Kit, P/N 14106

This High Flow, GM Fuel Rail Kit is designed to bolt to all GM, LS1 intakes, as found on Chevrolet Corvette and Camaro, as well as Pontiac Firebird/Trans Am. For use with upgraded fuel systems including A1000 and larger fuel pumps along with remote mount, return style regulators like our EFI Bypass Regulator P/N 13101. Perfect for popular LS1 Engine swaps into early Muscle Cars and Street Rods, making installation of AN Lines, along with external fuel pumps and regulators a snap!


Flow-through design eliminates hydraulic fluctuation.
Plated mounting bracket included for direct, bolt on installation.
-8 AN ORB (O-Ring Boss) ports create a positive seal and eliminate the need for thread sealant. Fittings sold separately.
5/8" i.d. through-hole provides flow capabilities to support 2,000 plus HP racing applications.

Brad

Are you building a showcar? serious question, not being a smartass

No, not a show car. I just like the clean look. The pic posted above dosent look bad. It just wasn't what I was expecting.

I have the same Speed Inc rails but my girl isnt very pretty so I didnt even think about it. right now the everythings in the box because its like 8 degrees outside so i cant even think about working on the old girl, you southern boys got it made! Good luck to you!

I know the size is 3/8 npt, but does anyone make a NPT fitting that dosen't flare? The fittings I have come across have a .020" rise in them, which dosent allow them to screw in but half way. I'd rather my adapters screw in all the way for a nice clean finish. Does anyone know of a straight 3/8 npt to -8an male/male adapter that dosen't flare?


funny you say that . my fuel rails [speed inc]look just like you want. maybe I turned nut in a little more than you did.no problems yet other than how they want you to attach the factory fuel line

I have the same Speed Inc rails but my girl isnt very pretty so I didnt even think about it. right now the everythings in the box because its like 8 degrees outside so i cant even think about working on the old girl, you southern boys got it made! Good luck to you!

LOL! its 23* outside right now and I am workin on someone elses car. I soo need a garage and not a carport.

If you are turning the fittings in by hand realise you will be able to get a few more turns on them with a wrench.

All in all I say get what you want. But it still looks clean either way.

Brad

funny you say that . my fuel rails [speed inc]look just like you want. maybe I turned nut in a little more than you did.no problems yet other than how they want you to attach the factory fuel lineI turned them as far as they would go. If I would have tightened them any more, they would have broken. Do you know what kinda fittings yours are? :)

Are you using teflon tape or a liquid teflon?

Brad

Liqid teflon with Aeroquip AER-2007 fittings. I've actually already sent the aeroquips back in exchange for the Earls to see if they are any better.

I think mine are Earls. Those are mine in the first pic I posted if that helps at all.

Brad

I'm sure the ones I get will fit the same as the aeroquips. I sent them back before knowing that the NPT fittings were tapered. I'll probablly just run these and be done with it.

I turned them as far as they would go. If I would have tightened them any more, they would have broken. Do you know what kinda fittings yours are? :)
mine are the ones that speed inc sent to me.i dont remember what manufactor they were made by .to much in a hurry to get them on and didnt pay no mind to who made them, sorry .

Go get a 3/8 pipe tap and run it in there farther. Then you can turn your fitting in more.

LOL! its 23* outside right now and I am workin on someone elses car. I soo need a garage and not a carport.

Brad

wow a car port.. that must be nice :cry:

i didnt think about it until now, but my front two fittings are called '-8 90* full swivel seal hose ends' and they tightened up flush with the speed rails... and you dont need the 3/8 to -8 fitting in between with them. too bad they were like $25 each!

I searched the whole town for a 3/8 pipe tap and never could find one.
As far as the hose ends go, I had to buy 90's for them any way so I still spent the $25. I saw the fitting you are refering to, but didn't want to get stuck with the 90 being turned the wrong way. They didn't look to be adjustable, but if yours are full swivel, then I guess I just missed out.

yea they spin around 360* without leaking