Speed Inc fuel rail problem
08-16-2006, 10:54 AM
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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...
08-16-2006, 11:05 AM
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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.
If not I'm screwed. 
08-16-2006, 04:36 PM
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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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08-17-2006, 08:35 AM
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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....
08-23-2006, 06:42 AM
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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-
-Jay-
08-25-2006, 02:38 PM
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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!
09-17-2006, 12:30 AM
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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!
09-21-2006, 08:57 AM
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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.
