fuel hose no longer boring

Thanks for the information Tomj,

I just looked at the underhood fuel hoses that I replaced on my Concord last summer, and they are all spongy and swollen. Ordered a couple rolls of 1/4 and 5/16 barricade line, as I've got 3 cars that are all in the same situation as the Concord. I dropped the tank on the Concord and replaced those last summer too - looks like I'm gonna be dropping the tank again - but at least now I know I'll be doing it with the right stuff.

joe, if you have hose now in-service, and a week/month? later it's not noticably soft, it's probably OK.

30R7 rating is gasoline-only as far as i can tell; not alcohol resistant. i found this page http://www.underhoodservice.com/correct-fuel-hose-installation/ that has a bit of explanation.

i think that, loosely, the common 30R7 hose is "old car" hose, and "fuel injection" is modern hose. i'm using "fuel injection" hose that has one of the low-permeability hoses. i don't know how stores ethically sell, in 2019, hose that almost immediately fails in service. it is very easy to see how this stuff could leak past under-tightened hose clamps. the short section i had from my new Tanks Inc tank to the fuel filter/pump produced about a tablespoon of an oily residue on the top of the tank. 

i need so little hose that i just bought the "fuel injection" hose from Pep Boys. nearly $5/foot! i think my 4 psi pump will be safe with 80 psi hose.

it's dismaying to have to exert so much effort over hose. it's easy to fix -- get good hose -- but i'm kinda pissed off we're offered fuel hose that literally is unsafe in the state it's sold in.

well that sounds like just a lot of fun. O_o