Highcroft Racing's hopes of a dream debut class win at the 78th Le Mans 24 Hours lie in tatters while its LMP2 HPD ARX-01c continues to sit in the pits.
Marino Franchitti dived into the pits early in the 20th hour and has been in and out on consecutive laps as the team struggles to fix a problem with its water system.
The continued delay has cost the team dearly, with Franchitti slipping from two laps adrift of the class-leading Strakka Racing HPD in second, to outside the podium places.
Team spokesman Paul Ryan said: "The water pressure sensor on the telemetry showed we were losing water, so we filled it up with water, but the car has had to come back in. There's air in the system."