They`re either E85 friendly or they arent.
Every hose is 15% compatible because that`s just regular gas for most of us.
The evils of ethanol are very exegerated.
As a matter of fact I hate marina no ethanol fuel .It`s 90 octane and it burns up blower engines. Ethanol lowers intake temps, you get higher octane and it`s more forgiving .
I fill up on land and only Top Tier fuel.
If I`m forced to get non ethanol I have to treat it with boostane which is not cheap.

The USCG fuel hose is super thick walled that I have seen. I was thinking it must be for either fume permeation prevention or give you a few more seconds of protection in the event of a fire. Maybe both?

I started using the non conductive braided teflon /steel braided hose about 8 years ago, it doesnt abraid and cut your fingers once installed, its not the easiest stuff to work with as coating is pretty rugged BUT works well!

Actually i was told from a coastie a few years back that one of the reasons is most people will run braided line all the way to the tank and the problem with this is electrical grounding. If you look at a stock fuel system....even if they have metal tubing like mercruiser does from the fuel pump to the carb or efi system....there is always a section of rubber fuel line acting as an isolation. If your main ground wire was to fail, then when you go to start the engine, the electrical load will search for a new grounding source.....so if your braided fuel line is now the next best ground for starting and completes the electrical loop....what do you think will happen when you try and run 600amps on that fuel line? POOF and up in flames the boat goes!

Thats what I ended up with and you’re right. It can be a bit of a fight so to speak but it’s nice. When I first used it I swore my fittings or hose was off like (1/2 AN)

Way less cat whiskers poking fingers!

KOOL tools is a must for making AN lines.
I replaced all my lines with Mr Gasket E85 compatible .

https://www.holley.com/brands/mr_gas..._braided_hose/

Heard a similar story abt someones clutch cable that kept breaking. Found eng ground was loose and clutch cable was the next best source for ground. It happens.

A ‘race’ car of mine was arching from braided line next to fuel regulator and arching to the firewall. I was lucky !

I question how good that hose is with e85. The manufactrer rates it 3 out if 5 stars for e85??

Curious if you smell gas fumes when stored inside?

I forget what hose I used (black nylon braid) but it leaches fumes. Very annoying. Only hose I will buy going forward will be ptfe lined.

The inner lining of the hose determines it's permeability. The extra wall thickness is how it gets it's A1 fire rating.
The regulations say it must survive 2 1/2 mins of exposure to flame. If the flames haven't been extinguished after 2 1/2 mins of a gasoline fire, you've probably already lost the boat. Also part of the testing requirements say the hose must be exposed to a surface temp of ~1200 degs F within 1 inch of the hose during the flame test.





https://newboatbuilders.com/pages/33CFR_Fuel.html