I could SWEAR -AN = 1/16". As in a -4AN = 4/16 = 1/4", etc.

But, when I ordered -4AN PTFE fuel line, it looks to be much smaller, possibly 1/8". The OUTSIDE diameter of the hose is about 1/4". I'm guessing they are measured in OD instead of ID? If so, I have to estimate which OD to order to get 1/4" ID?

 

This is my goto

https://www.pegasusautoracing.com/do...ocID=TECH00096

You are right about the measurements but it references the OD of rigid tube. So -4 has the same ID as 1/4 OD tubing.

 

Tricky. Looks like the sheathing is 1/8", so Ordered -6. That should be 3/8"OD - 1/8" = 1/4"ID, to fit my return line.

 

You could've gotten E85 rated hose at O'Reilly's for $4/ft...lol

Assuming you're not building an AN hose for your return.

 

Also, ID doesn't change because of the PTFE liner.

 

If you can find some in Fresno or Clovis, you let me know

I know. That's not what I was trying to say.

 

Then what were you trying to say?

 

Isn't -6 AN bigger than 1/4" ID? I thought -6 AN was a step up from stock return line size. According to that Pegasus site, -6AN is .34" ID.

 

-6 is a little bigger than the factory feed line, so if we are talking factory return its going to be too big. I'm not too sure how you would terminate PTFE lined hose to the factory return tube.

 

I'm guessing on the ID since I can't find a way to know for sure. I was having to *assume* the lining "adds" 1/8" to the ID and would equal the OD. Not sure how else to do it. I guess since we all use AN line with AN fittings, it's not usually needed.
As for a how-to, I'm gonna play with some ideas and see what pans out. I don't have a track day for a while, so may as well experiment
Until then I ordered regular stuff from O'Reilly's online as Sean mentioned.

 

You are going to use PTFE hose without a fitting? I would have thought that you'd never get the PTFE lined hose to seal without a 3-piece PTFE compression fitting.

 

My whole drysump is PTFE with reusable race fittings. XRP is pretty nice stuff.

 

I don't think it would. I am playing with parts and fittings I have around the garage. I just had a return line rot and split, spraying fuel everywhere Rather not have that happen again.

 

The lining does not add to the ID. AN sizing is standardized. If the ID isn't X, it's not -Y size line.

 

No, but if the lining is 1/16" thick then I can use that to estimate ID by using the OD.