Police have been forced to shut down a $100,000 fuel giveaway at a Melbourne petrol station after the stunt resulted in traffic mayhem.

The giveaway by a rewards club sparked a frenzy outside a Liberty fuel station in Truganina in the city’s west, with dozens of cars lining up around the block to in a desperate bid to nab a free tank of petrol.

Cars sat bumper-to-bumper on Leakes Road early today after the club’s founder Billy Beasley announced the Good Friday promotion, which was offered to drivers on a first-come, first-served basis.

Cars sat bumper-to-bumper on Leakes Road in Truganina. (9News)

The free fuel eventually dried up after several hours.

Some motorists ran out of fuel while waiting in line, with one driver resorting to pushing his car toward the pumps.

Some motorists ran out of fuel while waiting in line. (9News)
Police attended the scene about 7.30am. (9News)

Police attended the scene about 7.30am to manage the flow of traffic and establish hazards.

Beasley told 9News the giveaway only lasted under an hour before officers arrived to shut it down.

Four police units cars remain on the scene as traffic slowly clears.