There is no reason to estimate ID. Look at the hose you want on Pegasus and it literally tells you the ID.

 

it's just called fuel injection hose. every parts store has it. it is E85 compatible.

edit: it should be labeled SAE 30R9

 

For my project, I need to know what the ID is. It's not important, though. We'll consider the subject closed.
p.s. Pegasus = exactly what I needed to know. Gracias!

They have some nitrile hose labeled specifically for e85, so I may as well toss some of that on.

 

What we're saying is the website literally lists the ID.

 

Now I know so will check Pegasus.

 

On a related topic, is PTFE hose a lot harder to work with in making AN fittings and so forth? I know the fittings are different than normal AN, but this short video is not the first time I've seen someone say that the PTFE fittings are hard to seal and the lines are prone to kinking: Just wondering if I should avoid. Radium does sell PTFE lines already made up, which is very convenient if they do a good job assembling them.

 

Recently I used Earl's ultrapro and it was stupid easy to work with compared to stuff I have done in the past. Very flexible, doesn't kink, no hint of a leak, it's very good stuff IMO.