Abstract: A hydrogen assisted combustion engine system for a motor vehicle includes: an engine having an intake; an air filter; an inlet duct interconnecting the intake and the air filter; a throttle valve disposed in the inlet duct between the intake and the air filter; a hydrogen generator for generating a hydrogen-containing gas; a pump connected to the hydrogen generator and the inlet duct for pumping the hydrogen-containing gas from the hydrogen generator into the inlet duct; and a speed controller electrically connected to the pump and manually operative for adjusting a speed of the pump.