Not quite literally, in e.g. Soviet engine designs some gas generators are oxygen-rich, they produce oxidized exhaust of high temperature, and the engine still doesn't burn (usually).
> So, the turbopump has to outperform the combustion chamber in terms of pressure and flow rate.
Yes, the injector pressure drop can't be too small.
Not quite literally, in e.g. Soviet engine designs some gas generators are oxygen-rich, they produce oxidized exhaust of high temperature, and the engine still doesn't burn (usually).
> So, the turbopump has to outperform the combustion chamber in terms of pressure and flow rate.
Yes, the injector pressure drop can't be too small.