Therx7ist

Hey guys, I bought a set of S4 TII fuel rails online. The seller doesn't know if he sent me N/A or Turbo rails, How can I tell the difference?

classicauto

iTrader: (3)

Both ends of the S4 NA fuel rail are M12x1.25 instead of one end being M14x1.5

Go to: www.fc3spro.com and find the paralell fuel mod - if you have the same size fittings as the pic, you have a TII rail, if you have M12x1.25 ends on the primary you have an N/A rail

rotorforce

I don't think there is a difference. Then again if there is I will be proven wrong in no time.

classicauto

iTrader: (3)

no there's a difference - I learned about it yesterday

daten

The S4 NA fuel rails I have seen have a long flat flange for the FPR on the secondary rail, where the S4 turbo rail has the FPR just screw in.



I don't have primary rails for S5 NA or S4 NA available to compare.

rotorforce

Your right I actually have one of all three at my parents house. Someday I will go there and bring all the totes full of FC parts back to my house.

Therx7ist

Ok, here's the problem. The primary rail I got from the seller has 2 m12x1.25 sides. The secondary rail look slike the red one in the pic up top. So I got one N/A and one TII? I do have another primary rail, the 2 sides on it are different sizes, this must be the mate to the TII secondary I accidentally threw out?

rotorforce

Hmm the TII primary I have in my hand has one 12mm and one 14mm side.

Therx7ist

This secondary rail seems to bolt up perfectly, but what if I'm wrong?