An investigation has begun into the theft of 15,000 litres of petrol from a service station at Croydon in Sydney's inner-west.
The owner of the Elizabeth Street service station had no idea he had been robbed until yesterday morning when a customer complained that a pump was not working.
When he checked the underground tank, its padlock and latch were missing.
Also missing were 15,000 litres of unleaded petrol worth about Aus$20,000.
Police believe the petrol was stolen sometime after Wednesday night, when the owner last checked it.
Their only clue is that a nearby resident heard a truck idling about 2:00am AEST yesterday morning.