Oscar Piastri was allowed to put McLaren's 2026 F1 challenger through its paces on Thursday after champion Lando Norris had the honour of driving the MCL40 for the first time a day earlier.
After a reasonably productive morning with 48 laps at Barcelona's Circuit de Catalunya, the Australian failed to make it out on track in the afternoon.
Unfortunately for McLaren and Piastri, RacingNews365 can confirm the team discovered an issue with the fuel system.
It means over its two days of testing so far, McLaren has completed 124 laps.
It has one final day of running to add to its tally on Friday, with both Norris and Piastri splitting duties with half a day apiece.
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