For Detroit the Hart Engine was replaced by the Ford Cosworth DFV but the Dutchman failed to qualify.[12] Rothengatter retired from the Dallas Grand Prix with a Fuel Leak,[13] For Britain the Dutchman was nine laps down and was not classified.[14] The German Grand Prix saw Rothengatter finish ninth,[15] At Austria the Dutchman was twenty eight laps down and was not classified.[16]