JL Petroleum Pte pleaded guilty to the charges in court on 18 August 2015, according to a statement from the Maritime and Port Authority (MPA).
The MPA had brought charges against JL Petroleum for supplying bunkers on 14 occasions between 2 and 25 June 2013.
In addition, JL Petroleum had also used the bunker delivery notes belonging to Excel Petroleum Enterprise Pte Ltd for the deliveries.
MPA had earlier cancelled Excel Petroleum Enterprise's bunker supplier licence on 15 January 2014 for the company's involvement in this case, as its actions had breached the terms and conditions of the licence.
"The bunkering industry is an important and integral part of the Port of Singapore," the MPA said in a statement.
"All bunker suppliers operating in the Port of Singapore must be licensed by MPA, and all licensees must adhere strictly to the terms and conditions of the licence.
"Any licensee found to have contravened any terms and conditions will have his licence suspended or cancelled."
The MPA said it adopts a "zero tolerance approach" towards bunkering malpractices and will not hesitate to take action against any unlicensed entity operating in the Port of Singapore.
It warned all licensed bunker craft operators to "refrain from delivering bunkers on behalf of any person, firm or company that is not a bunker supplier licensed by MPA".
The bunkering industry in Singapore is a lucrative business with more than 65,000 bunkering operations taking place every year.
Its bunker industry is a major revenue earner with the sector generating income of around SGD20bn ($15.2bn) a year.
As at 5 August 2015, MPA listed a total of 59 licensed, or accredited, bunker suppliers in the port of Singapore.
