Grey fuel hoses are bad, what about black ones? 99 747 engine Challenger 1800

[car5car]

I have read somewhere that grey fuel hoses rot and clog carbs. I was going to replace hoses but it looks like they where replaced already they are black. Should I check them or black ones OK?
I have couple very small grey ones. If they are oil hoses do they rot too? Thanks.

 

[All Things Custom]

The grey lines are a defective hose used by seadoo. if they are black then they have been changed and you are fine.

The grey lines have a silicone member inside them that gas breaks down and it ends up in your internal carb filters causing a lean condition and damaging the motor if let go too long.