WILMINGTON (CBS) — A costly glitch at a gas station allowed drivers to fill up for $1.10 a gallon.

The mistake happened at a Vallero station in Wilmington Sunday between the hours of 8:30 to 11:30 a.m.

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The manager of the station said a computer glitch caused the error that allowed customers to take advantage of the discounted fuel for three hours as word quickly spread around the area.

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“I was shocked that it even happened,” said Aureliano Galvez who filled up his tank for less.

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Kenny Nguyen, whose family owns the gas station, said that 8,000 gallons of gas were sold during glitch resulting in a loss of $21,000.