Wasn't necessarily anything in the fuel to cause that. I work on helicopters and when a hose fails, it fails! The failure worse than that is when the individual layers of rubber seperate within the hose, then under pressure it closes off; but when you pull the hose and look through it, it is clear. Very frustrating.
My buddy parked his 70 Chevelle bracket car one October, come April, when we turned on the fuel pumps, it looked like an El Toro lawn sprinkler under the hood.
That is why solid line is always best where ever possible. You just never know.