It's more viscous. Meaning, it isn't made to fit through the VERY tiny
openings in a typical fuel injector.

Who told you the orifice in a fuel injector was "tiny". It is actually pretty
big and they manage fuel flow by pulsing it open and closed rapidly with a
pulse width modulator. It is certainly as big as the idle screw passage in any
outboard or even the main jet in a small outboard.
Guess again.