Perhaps a better analogy would be traveling via Cannon.
You can only load a charge into a cannon up to a certain point without shattering the barrel. Shooting yourself out of a cannon, you could travel any distance up to this maximum value.
Turn it around and imagine that you are firing the cannon out of the back of a vehicle to propel it forward. Your 'engine' is capable of a single great burst of speed and energy release, but that burst is limited by the size of the charge that may be safely expended without rupturing the cannon.
My suggestion for a 'streaming fuel FSD' would be more like taking that cannon and turning it into a jet engine.
You can only load a charge into a cannon up to a certain point without shattering the barrel. Shooting yourself out of a cannon, you could travel any distance up to this maximum value.
Turn it around and imagine that you are firing the cannon out of the back of a vehicle to propel it forward. Your 'engine' is capable of a single great burst of speed and energy release, but that burst is limited by the size of the charge that may be safely expended without rupturing the cannon.
My suggestion for a 'streaming fuel FSD' would be more like taking that cannon and turning it into a jet engine.