AN/NPT Fittings question. Running aftermarket fuel rails

[CJ_]

So I have a set of IE fuel rails I want to run and Im a noob with AN/NPT fittings. After some of research, I drew up a diagram of what I thought would work, but I wanted to get some help before I go order all this stuff (Its not cheap).

The ends of the fuel rails are -8an o-ring boss ports
The inlet/outlet of the FPR housing are -6an o-ring boss ports

Can I use the NPT to AN fittings in the diagram?

Here is my diagram:

[Audi9]

So the rails and the regulator are NPT? I would assume so and in that case youre correct

And awesome drawing/diagram by the way

[CJ_]

So the rails and the regulator are NPT? I would assume so and in that case youre correct

And awesome drawing/diagram by the way

Thanks, The ports are labeled on IEs website as -8an o-ring boss port and -6an o-ring boss port which is kind of my question..

Does -8an o-ring port = 3/4 -16 NPT
and -6an o-ring port = 9/16 - 18 NPT?

[FlyboyS4]

When I get a chance I'll see if I can find the part sizes I used.

[jballou]

NPT is totally different than -an size. If IE calls for a -8an O-ring fitting, that is what you must buy. Don't try and save money, it will just cost you more later on.

[CJ_]

NPT is totally different than -an size. If IE calls for a -8an O-ring fitting, that is what you must buy. Don't try and save money, it will just cost you more later on.

Awesome, thats the answer I was looking for, thanks..

So this is the fitting I would need to run the 90ºs out of the rails then correct?

http://www.jegs.com/i/Russell/799/670700/10002/-1

[Mikse]

At what power level single feed isn't enough anymore, is there any experience (in any platform?). I was going to feed both rails separately.

[Corbett]

At what power level single feed isn't enough anymore

None

[redline380]

NPT is totally different than -an size.

Not really. The AN fitting size is just how many sixteenths the OD is. So, a -8an fitting would be roughly equivalent to 1/2 NPT.

[jballou]

Not really. The AN fitting size is just how many sixteenths the OD is. So, a -8an fitting would be roughly equivalent to 1/2 NPT.

Ah, it says closest AN fitting Size. I would just stick with the -an size.

[jballou]

Awesome, thats the answer I was looking for, thanks..

So this is the fitting I would need to run the 90ºs out of the rails then correct?

http://www.jegs.com/i/Russell/799/670700/10002/-1

Looks about right. When I did my dual in-tank fuel pump set-up from SRM (their Kit,) I still spent a ton of money on extra fittings and lines as I wanted to run the stuff my way. It can get spendy quiet fast.

[jballou]

You can also do a 90 degree O-Ring fitting as well if you want to keep things a little tighter.




http://www.summitracing.com/parts/rus-612470

[redline380]

Ah, it says closest AN fitting Size. I would just stick with the -an size.

I'm confused. Doesn't he just want to use NPT adapters to go from NPT on the rail to AN lines? Nothing wrong with using adapters, just use ones with similar ID's.

Nevermind- I reread the OP. Yeah, you cant jam an NPT fitting into a AN thread! That will definitely leak. Need to keep it AN all the way around. I thought the rails had NPT threads on the ends.

[CJ_]

I'm confused. Doesn't he just want to use NPT adapters to go from NPT on the rail to AN lines? Nothing wrong with using adapters, just use ones with similar ID's.

Nevermind- I reread the OP. Yeah, you cant jam an NPT fitting into a AN thread! That will definitely leak. Need to keep it AN all the way around. I thought the rails had NPT threads on the ends.

Sweet! Definitely got my answer.

Those 90º o-ring fittings look perfect. Thanks Justin!

[Mikse]

At what power level single feed isn't enough anymore.

None

That confident answer must have first-hand experience to back up a claim.

[Audi9]

Haha good thing this thread didn't get confusing.

If the rails/regulator are AN threads then you'll have to stick with that as NPT threads are tapered while AN are standard with a 37* flared mating surface

[zillarob]

I wouldnt use 90s off the reg and feed.

This is with 90s




This is with (iirc) 45s so I could route the lines along the firewall and out of the way.

[CJ_]

I wouldnt use 90s off the reg and feed.

This is with 90s


This is with (iirc) 45s so I could route the lines along the firewall and out of the way.

Ahh, yeah that looks alot better

[rnagy86]

This is what I did, 8AN feed to dual 6AN and 6AN return. Everything fits perfectly.

[mauromj]

This is what I did, 8AN feed to dual 6AN and 6AN return. Everything fits perfectly.

Is that stainless hose painted black? Looks good!