You are very fortunate that you did not blow up the engine. That mistake is really easy to do, even experienced diesel people have done that, but would not admit to it.

There was a guy here at work that did that to his new F250. That powerstroke ended up with a couple of holes in the block (Happened on the Interstate going 75 mph, he felt some hesitation, mashed the pedal, BOOM!). RUG and compression engines just do not mix.

While you do your system bleed, also change your filters.

Good luck!