SpaceX Raptor: Methane fueled full-flow staged combustion cycle engine

So in order to shove more propellant into the engine, you could either increase the pressure in the tanks, or just shoot the propellant into the combustion chamber with a high powered PUMP. We have the gas generator cycle, the partial flow staged combustion cycle and lastly we’ll look at the full flow staged combustion cycle… and perhaps in a future article I’ll try and do a full rundown of all liquid fueled rocket engines including fun new alternatives like the electric pump fed engines seen on Rocket Lab’s Electron rocket. The turbopump has a few main parts, a mini rocket engine called the preburner, a turbine connected to a shaft and then a pump or two that push propellant into the combustion chamber.

Source: everydayastronaut.com