fuel line vs pipage

fuel line and pipage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuel line	Yes	No	No	No
pipage	Yes	No	No	No

As nouns, pipage is a hypernym of fuel line; that is, pipage is a word with a broader meaning than fuel line:

fuel line: a pipe that carries gasoline from a tank to a gasoline engine
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of fuel line include pipe, piping.

fuel line (noun)	pipage (noun)
a pipe that carries gasoline from a tank to a gasoline engine	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a fee charged for the use of pipes