gas line vs petrol line

gas line and petrol line both are nouns.

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

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

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

Other synonyms of gas line include fuel line.

gas line (noun)	petrol 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