Chaz Mostert’s car on the deck with the fuel hose still coupled. Image: YouTube
Mostert endured a slower than planned first stop thanks to a failed right-rear rattle gun, which the team covered by continuing to add fuel.
However, the car was eventually dropped from its air jacks before the fuel hose had been disconnected, marking a clear breach of the rules.
The incident was the subject of a post-race hearing at which the competitor admitted the breach and accepted the recommended penalty of 30 teams’ championship points.
That will be an unpopular outcome among rivals, as the extra fuel gained while the hose was still connected can be considered a performance advantage.
Shane van Gisbergen lost the 2018 title after receiving a post-race time penalty for a similar infringement in the penultimate race of that season.
Walkinshaw TWG Racing was also docked a further 20 points – made up of 10 per car – for failing to comply with refuelling notification procedures during Sunday’s race.
Teams are required to inform Supercars of the fuel transferred to each car in litres within five laps of each pit stop.
The team had also failed to comply with that requirement in Saturday’s race, after which they were reminded of the obligation by Supercars.
The penalties mean Walkinshaw TWG stays behind Tickford Racing in fourth in the teams’ championship standings.