I would like to know what size an adapter I need to connect billet fuel rails to the oem fuel line? I know the sizes are 5/16 and 3/8 but which one is the correct one to buy to connect to the SS lines. Thanks

 

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What type of fuel system is it?

 

Looks like a factory return style. Just need a pushlock fitting for the lines and the rest of your fuel lines plumbed up however you want, braided stainless, etc..

 

Return style. You need both 5/16 and 3/8.

 

So it is a return style. My best question is do I need a for? I seen alot of threads with turbos but not na. And how do I route it? Fuel line to rail to crossover to rail to return? Thanks for the help.

 

For billet rails your going to have to get an FPR (if you didn't know). For my system that I am planning for my 408, I am bringing the factory line to the regulator, return from reg. to factory return line. Then running the out to a Y fitting and plugging the other end of the rail.

Fittings I am going to use:

3/8: fitting - http://http://www.summitracing.com/parts/RUS-640940/
5/16" fitting - http://www.summitracing.com/parts/RUS-640930/

 

That answers another question, thanks. Is it the size of the billet fuel rails that requires an FPR?

 

The stock regulator is built into the stock crossover between the rails. So if you remove the stock rails, you have to add in a regulator. Which rails are you looking at?

 

Generally you want the regulator after the rails so the regulator only has to handle the excess fuel and not all of it. On a NA setup I doubt it will matter though.

 

That is the reason why I am doing it that way. It is easy, cheaper, and I don't see fluctuations in fuel pressure being to big a deal in a "smaller" cube N/A setup. On boost, not so much.