Ok, sorry, my bad. I didn't explain myself very well. Beside I have this pedantic thing about the meaning of words and reasons that are given.
A pipe has a fundamental design function - i.e. a tube that allows fluids to be moved about while also remaining contained.
Hence if the pipe is faulty e.g. it has a hole, or it's a sheet of metal, then it is no longer a pipe.
If, on the other hand, the design of the fuel system is faulty such that a pipe somewhere in that system keeps getting blocked (or something else) then the fuel system is faulty. (not the pipe, as it would still be a pipe, just a misplaced/misused pipe)