Much earlier than that; there were running mechanical fuel injection protoypes for gas engines before WW1 (diesel got FI quicker); mass-market mechanical fuel i

Much earlier than that; there were running mechanical fuel injection protoypes for gas engines before WW1 (diesel got FI quicker); mass-market mechanical fuel injection followed WWII-the Mercedes 300SL had FI in 1955. Thing is, mechanical FI is almost as hard to tune for emissions and economy as carburetors, so electronic control is necessary. Chrysler offered an EFI system based on the Bendix Electrojector in '58, but the tech was not fully baked, for one thing, the electronic controls were vacuum tubes in an enclosure in the dash; I think there may be one remaining operational '58 Imperial with that system still running.... Anyway, Bendix sold the patents for the Electrojector to Bosch, which a decade later had developed them into the J- and K- Jetronic transistorized throttle-body EFI systems so beloved by Porsche 914 enthusiasts.