<Li> 1914: German U-boats were powered by MAN diesels . </Li> <Li> 1919: Prosper L'Orange obtained a patent on a prechamber insert and made a needle injection nozzle . First diesel engine from Cummins . </Li> <Ul> <Li> 1921: Prosper L'Orange built a continuous variable output injection pump . </Li> <Li> 1922: The first vehicle with a (pre-chamber) diesel engine was Agricultural Tractor Type 6 of the Benz Söhne agricultural tractor OE Benz Sendling . </Li> <Li> 1923: The first truck with pre-chamber diesel engine made by MAN and Benz . Daimler - Motoren - Gesellschaft testing the first air - injection diesel - engined truck . </Li> <Li> 1924: The introduction on the truck market of the diesel engine by commercial truck manufacturers in the IAA . Fairbanks - Morse starts building diesel engines . </Li> <Li> 1924 - 1925 Fairbanks Morse introduced the 2 stroke Y - VA and Model 32 . It was the first cold start diesel manufactured by Fairbanks and would become an icon of American industrial power . </Li> <Li> 1927: First truck injection pump and injection nozzles of Bosch . First passenger car prototype of Stoewer . </Li> </Ul> <Li> 1921: Prosper L'Orange built a continuous variable output injection pump . </Li>

When was the first diesel engine put in a truck