It's been a couple of years since I last messed with fuel lines, and apparently I had forgotten this.
I'm exactly one fitting away from having Jane ready to rock. One single, 45*-angle, -6AN female PTFE fuel line fitting away. So I order a very nice-looking Fragola fitting that fits that description. It arrives and something kind of jiggles in the back of my mind but I'm not sure what.
I go to install it on the end of the line. It goes on hard, so I pull it off after turning a single thread on and it is full of metal shavings already.
I clean it back up and throw some more lubricant in there on both sides of the fitting.
I start tightening it again and it starts making metal shavings again.
I pull it back off.
I notice that the collar is not pulling up over the ferrule appropriately, making it so only a thread or two can engage on the fittings before they are doing heavy duty work compressing the ferrule and hose together while being tightened. Alarm bells are ringing in my head.
I try to pull the collar further up the fitting over the ferrule. Mostly, I fail.
I pull the collar back and trim the braided steel hose over the PTFE inner liner so that less of it is sandwiched between the ferrule and the collar.
I reinstall the collar and throw some more lubricant on there.
I start to put the fitting together. It seems to be going much easier this time. I am hopeful.
The fitting then strips out.
I finally remember that I have had trouble with this exact fitting before in the past... and pull out my box of destroyed Fragola fittings, which I have just remembered about. And yeah, there was already an identical fitting in there.
I really, really hate Fragola fittings and I'm really, really (not) glad that I remembered this AFTER buying them. Ugh!
Another order in with Summit to get some steel Aeroquip fittings... don't know why Earls or Summit brand isn't available in a 45* fitting but it's driving me up the wall.
Please consider this your PSA to not use Fragola fittings, but especially not the 45* angle ones which are for some reason made of thinner paper than the rest.