Fueling & Injection - Speed Inc fuel rail problem




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2001 Pewter WS6
08-16-2006, 10:54 AM
I bought a set of used Speed Inc fuel rails and read on their site that the fitting was supposed to be 3/8" NPT. So I ordered the fitting from Summit and it was too small. I could slide the fitting in and the threads wouldn't touch. So I figured it had to be 1/2" NPT and when I tried it, it was too big. I seems like it needs to be 7/16" NPT but there is no such size. Does anyone know what size it actually is??? I guess the older fitting's were a different size at some point in time...


davered00ss
08-16-2006, 11:05 AM
I just ordered FAST fuel Rails, and the AN fittings do not screw right into the rails. There is a plastic Male/Male screw fitting that goes into the rails, then to the AN fittings. That is probably what you are missing.

davered00ss
08-16-2006, 12:10 PM
Black fittings in pic.
http://i3.photobucket.com/albums/y63/dgrundwalski/Picture405.jpg

Try to PM Nate from Nasty, I'm sure he can help you.


2002_Z28_Six_Speed
08-16-2006, 01:31 PM
That is a good looking product. If you have the proper fitting is the rest of the install pretty simple?

Do factory injectors fit that fuel rail?

davered00ss
08-16-2006, 03:01 PM
They better. :jest: If not I'm screwed. :jest:

davered00ss
08-16-2006, 03:01 PM
I just ordered the fittings & fuel line from Nasty. :)

Country Boy
08-16-2006, 04:36 PM
I bought a set of used Speed Inc fuel rails and read on their site that the fitting was supposed to be 3/8" NPT. So I ordered the fitting from Summit and it was too small. I could slide the fitting in and the threads wouldn't touch. So I figured it had to be 1/2" NPT and when I tried it, it was too big. I seems like it needs to be 7/16" NPT but there is no such size. Does anyone know what size it actually is??? I guess the older fitting's were a different size at some point in time...


Make sure youre not using AN fittings instead of NPT. My Speed Inc rails are 3/8 NPT.

SVC707
08-16-2006, 08:42 PM
i just checked mine and they are infact 3/8 npt part number is "fcm2007" 3/8npt to -8an

"fcm2005" 3/8npt to -6an

hope that helps

SVC707
08-16-2006, 08:46 PM
http://img.photobucket.com/albums/v482/svc707/IMG_0310.jpg

fittings galore let me know what end you need and ill look it up for you

2001 Pewter WS6
08-17-2006, 08:35 AM
A friend of mine had an -8an fitting and it screwed right in. There was no way the 3/8" NPT was right, I tried it and the threads didn't even touch. Way too small....

1QUIKWS6
08-23-2006, 06:42 AM
Are you sure the rails are NPT? Every rail I have seen has straight threads in each end - hence the reason you use the fittings with the O-rings as pictured in the post showing the FAST rails...

-Jay-

RedWS6 00
08-23-2006, 07:45 AM
Do factory injectors fit that fuel rail?

Yep they do.

2001 Pewter WS6
08-25-2006, 01:26 PM
I used -8an with an o-ring and it worked like a champ....

C5Fire
08-25-2006, 02:38 PM
Aeromotive just came out with a direct bolt on rail kit for the 98-02 LS1 f-body. Comes with rails, fitting and braided lines. It even comes with an adapter to plug into the stock feed line and changes it to two -8AN feeds. A buddy of mine just got the prototype system installed. Looks great!

Black Plague
09-17-2006, 12:30 AM
Aeromotive just came out with a direct bolt on rail kit for the 98-02 LS1 f-body. Comes with rails, fitting and braided lines. It even comes with an adapter to plug into the stock feed line and changes it to two -8AN feeds. A buddy of mine just got the prototype system installed. Looks great!
Cant wait to get the kit! Is there any Idea on when they will list the kit for sale?

Jimmyz
09-20-2006, 08:17 PM
I just found it on Summits site:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=AEI%2D14106&N=700+115&autoview=sku

Black Plague
09-20-2006, 08:24 PM
Those are just the rails. See the post fuel rails whats needed? I belive part# is 14139.

C5Fire
09-21-2006, 08:57 AM
Just call summit and tell them you need a special order. Aeromotive just released part # 14139 which is the 98-02 F-body rail kit. It came with everything to replace the factory rails. No need to guess what fittings to get and how much line, staight forward and simple.