gas line vs fuel line

gas line and fuel line both are nouns.

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

As nouns, gas line and fuel line are synonyms defined as:

gas line and fuel line: a pipe that carries gasoline from a tank to a gasoline engine

Other synonyms of gas line include petrol line.

gas line (noun)	fuel line (noun)
a pipeline used to transport natural gas	a pipe that carries gasoline from a tank to a gasoline engine
a pipe that carries gasoline from a tank to a gasoline engine
a queue of vehicles waiting to purchase gasoline