I removed them from my car. I had a fuel leak that I could never trace. I had the fuel pump off and replaced, carb in bits to check float level, etc etc etc. Never found the source of the fuel stink, until one day the carb had no fuel getting to it at all. Had the hose been the traditional rubber type I would have seen the damaged hose instantly, but these things can hide a lot of sins.
Just my experience. When I bought the car and saw they were fitted, I thought they looked the business. Nowadays I just want my car to work!
Best,
Mickey