petrol line vs gas line

petrol line and gas line both are nouns.

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

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

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

Other synonyms of petrol line include fuel line.

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