Up until the 2000s diesel engines in cars used mechanically controlled injection. With those, once started, the engine will run without any electronics. Engine

Up until the 2000s diesel engines in cars used mechanically controlled injection. With those, once started, the engine will run without any electronics. Engines produced for industrial applications (such as tractors) in developing countries still use this, as it's a lot simpler and more reliable. Military trucks are the same. Just don't tell the EPA.