Here’s one reason: The ethanol in modern gasoline—about 10 percent in many states—is so corrosive, it eats through either the fuel-pump diaphragm, old rubber fuel lines or a pot metal part ...

Most of the time, it's a broken wire, busted distributor rotor, bad ground, cracked distributor cap, ruptured fuel pump diaphragm, faulty ignition switch, or you've run out of gas.

‌ READ MORE: The big questions about the ban on petrol cars from 2040 answered When your car's fuel tank is not full, air is drawn from the tiny hole (of the nozzle) to the diaphragm due to suction.