Carolyn Van der Veen, a spokeswoman for Irving Oil, said in an email on Friday that the refinery suffered a "minor upset" on Thursday.
"But there are no production problems at the refinery. It's normal operations here and business as usual," Van der Veen said in an email.
While Irving Oil is denying any ongoing problems at its New Brunswick refinery, concerns over possible production issues caused gasoline markets in New York to spike upward on Thursday.