I'm assuming you mean this post
Basically, the quick disconnects used on the fuel line(s) are plastic, can get brittle with heat/time, and might break.
It was more of a problem on the older Brick motors, because you had two in-line pairs, unsupported, sitting right above the engine. Any flexing or movement put stress on the thinner part of the male QD and could result in a crack, especially if handled roughly during bike maintenance.
On the Slant/4 motors, you have one 90° male elbow and one flange-mount female, sitting higher up the gas tank (and thus further from the hot motor).
If you're not seeing a fuel leak or smelling fuel, I wouldn't stress about it too much.
But I would source the correct metal elbow to have on hand the next time you have to pull the gas tank off. I'd leave the female side in place, as it's quite easy to over-tighten those and crack the fuel pump plate (thus causing the leak you were trying to avoid). Also, the female QDs don't really fail, so they're fine to leave in place.
The parts can be bought from omega.com
, and you want part # FT-LCD230-04 VITON 1/4" ID, Elbows, Hose barb, 1.28" Length, Shutoff, Insert 1/4" flow.
There is a picture of the fitting at the bottom of this page
Make sure you specify the Viton o-ring, as that is fuel safe.
Another failure mechanism is if you're sloppy connecting/disconnecting these, you can nick the sealing o-ring and also cause a leak. Make sure the female QD is opened up (by pushing in the metal tab on the side), line the male QD up straight, and push straight in until it clicks and the QD's seal together.
If you're careful, the o-rings will last just fine.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...