Ferrari enjoyed strong straight-line performance throughout the 2019 season, with their performance being particularly strong between the Belgian and Mexican Grands Prix, where they scored six consecutive pole positions and their only race wins of the season. As their form had noticeably improved when compared to their first 12 races of the season, Red Bull issued a query to the FIA asking for clarification if utilising a system that got around the fuel flow sensor would be allowed. The FIA responded before the United States Grand Prix, reminding all competitors through a technical directive that such systems would not be allowed. Subsequently Ferrari's form faded as they failed to score a pole position or a race win in the remainder of the season. Mercedes-powered Lewis Hamilton claimed that Ferrari had lost power after the technical directives, while Honda-powered Max Verstappen accused Ferrari of cheating.