I'm sensitive plastic flavors, and ended up replacing all of my vinyl beer lines with bev-lex ultra seal barrier tubing. As Yooper hinted, if the first glass of the drinking session has a worse off flavor than the ones poured right after, it's likely the beer line leaching stuff into the beer. If that's the case, new vinyl lines would most likely make the problem worse, not better.
I'm trying to find some porn filmed by a dog wearing a GoPro. - SharonaZamboni
Hunter, when you get bored, will you put a taco in my elephant's hands for me? - Hat