It's absolutely possible, but I don't think that's much practical to be use.
Like I said, in diesel engine, there's no spark required to ignite the diesel, it's just using high pressure.
And if the bubbles of oxygen you used to pass through the liquid form fuel has enough temperature,
the fuel will be ignited by burning the oxygen.
HOWEVER, I think the flame will follow the path of the oxygen into the tank full of oxygen,
and cause huge explosion, which is not practical.
Just piece of comment (as an undergraduate engineer), correct me if anything wrong.