"Fiero" Fuel filter fitting and others using below ends and similar uses orange-ish color 0-rings.
To Fit Fuel Filters GM GF652 #25171792 GF481, FRAM G3727, and related numbers in other brands.
Can get thru many places as dorman part(s) like 800-013 Fuel Line Viton O-Rings - 2 Each - 5/16 In. and 3/8 In.https://www.dormanproducts....p-30428-800-013.aspx
If you install those ends w/o O-rings will often leak.
You might get lucky to avoid leaking but often you wreck the end of tube and whatever goes into because you way over torque the "nut" treating as Flare fittings.
When tighten to install...
put 2 "flare wrench" on one end so can squish two together like pliers.
You only tighten enough won't get loose.
I can't find torque for this. Is likely a few In/oz not even 1 ft/lb.
Filter and lines are fixed mounted so the fitting won't move.
------------------Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)The Ogre's Fiero Cave
[This message has been edited by theogre (edited 04-30-2021).]