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Speed Inc fuel rail problem

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Old 08-16-2006, 10:54 AM   #1
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Default Speed Inc fuel rail problem

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...
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Old 08-16-2006, 11:05 AM   #2
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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.
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Old 08-16-2006, 12:10 PM   #3
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Black fittings in pic.
Click the image to open in full size.

Try to PM Nate from Nasty, I'm sure he can help you.
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Old 08-16-2006, 01:31 PM   #4
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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?
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Old 08-16-2006, 03:01 PM   #5
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They better. If not I'm screwed.
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Old 08-16-2006, 03:01 PM   #6
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I just ordered the fittings & fuel line from Nasty.
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Old 08-16-2006, 04:36 PM   #7
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Quote:
Originally Posted by 2001 Pewter WS6
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.
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Old 08-16-2006, 08:42 PM   #8
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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
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Old 08-16-2006, 08:46 PM   #9
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Click the image to open in full size.

fittings galore let me know what end you need and ill look it up for you
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Old 08-17-2006, 08:35 AM   #10
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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....
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Old 08-23-2006, 06:42 AM   #11
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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-
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Old 08-23-2006, 07:45 AM   #12
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Quote:
Originally Posted by 2002_Z28_Six_Speed
Do factory injectors fit that fuel rail?
Yep they do.
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Old 08-25-2006, 01:26 PM   #13
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I used -8an with an o-ring and it worked like a champ....
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Old 08-25-2006, 02:38 PM   #14
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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!
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Old 09-17-2006, 12:30 AM   #15
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Quote:
Originally Posted by C5Fire
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?
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Old 09-20-2006, 08:17 PM   #16
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I just found it on Summits site:

http://store.summitracing.com/partde...5&autoview=sku
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Old 09-20-2006, 08:24 PM   #17
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Those are just the rails. See the post fuel rails whats needed? I belive part# is 14139.
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Old 09-21-2006, 08:57 AM   #18
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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.
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Old 09-21-2006, 08:57 AM
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2500hd, 6, bolts, fittings, fuel, install, problems, rail, rails, silverado, speed


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