Circle K says up to 87 customers may be impacted after diesel was inadvertently delivered into a petrol underground storage tank.
The retailer says it happened at its Kill North Service Station in Kildare between 2pm and 7pm on Saturday afternoon.
"Having reviewed CCTV and sals data, we know up to 87 customers may have been impacted by this issue," it said in a statement.
It adds the issue has since been resolved, with all pumps now operating normally, and it has apologised to all customers impacted.
Circle K says it's ready to assist anyone caught up in the "isolated incident" with any potential claims.
On Saturday July 29th between the hours of 2pm – 7pm at our Circle K Kill North Service Station (on northbound lane of N7, W91 XF97), all petrol pumps at this service station were impacted by an isolated incident where diesel was inadvertently delivered into a petrol underground- pic.twitter.com/m8lGbuHSNq
— Circle K Ireland (@circlekireland) July 31, 2023