How can I convert the carb fuel inlet and outlet to -6AN or -4AN? I like the look of the steal braided line with -AN fittings better. I'm trying to get away from using clamps.

 

It looks like to can use a compression fitting if the size matches up. Still looking for comments or suggestions.

Earl's Hard-Line AN Tube Fittings - JEGS

 

yeah, thats pretty much the only clean looking option with the nikki. Its too bad that no one has produced any -5an, esp as so many vehicles already come with 5/16 fuel lines

 

If you do follow through on this can you post pictures?

 

use -6 but you can still use a 5/16 fuel injection line. be sure to soak the fuel line with hot water. once it is soft, install it on the fitting. this is what ive done to my carbs. note that the weber has the same inlet thread pitch as the old school nikkis but havent compared them with the rx7 nikki

 

Thanks, this is what I needed. I'll use the carb side fittings like what you have and then make up steal braided lines. I wonder if I can get the back flow restrictor with -6an fitting. I'll do some searching.

I probably wont start this project until after I powder coat one of my old carbs.

 

My RX-3 with 13-B bridge/52 mm IDA's return line has a restrictor from a rx7 but i used a 5/16 line coz the AN is too hard to compress with a hose clamp. you can see this on the above pix. i have no experience with steelbraided but im sure it is the same as the aeromotive non steelbraided lines

 

Steel braided for fuel lines is a bad idea. If you ever loose a ground strap, what is the next available ground? It is the steel braid. Let's just say vapor lock won't be a problem anymore. Where's that evil looking smilie?

Just use EFI rated rubber (neoprene) fuel line and be done with it. It lasts forever on a carb.

 

FYI- they do make a -5 AN. It's standard on oxygen systems on airplanes.

 

They have them in stock at my local A+A, from a brand called Aeroquip