Tygon fuel line.

I put some .25" clear yellow Tygon fuel line on my sled and I am not happy. I paid premium price and thought I was buying a premium product. The tube turned milky within two weeks. Can't see the fuel. The part that went milky has gone very limp (phrasing) compared to the new lines. I am also having a leak at the carb fitting. I understand that the carb fitting may be sized for 6mm not .25" but this is first time I have ever had a problem on any machine. No leaks at the fuel pump side. I tried the next size smaller flat spring hose clamp, it was tough to get on and it did not fix the issue. Put a serious crimp in my snowmobiling. Has else had a similar problem? I will probably end up at Napa and buy some black tube, but I am still hoping to find some clear tube that will work. It is labeled Saint Gobins Tygon. I there a chance that it was counterfeit? Has else had similar problems? Any recommendations on good clear fuel line?

Thanks
John

Tygon fuel line.