you are supposed to use teflon paste (not tape, it can ruin your solinoids, and clog your lines) you use it on ALL the pipe fittings, not the AN fittings. I am damn sure that you leaked out your nitrous because of it.
As far as your engine is concerned, get it flushed professionally flushed. I have never done that sort of thing before but i think they hook it up to a pump and just let oil get ran through it without the engine running (Dont quote me though, I may be wrong) when you pull your old pump, look to see if it got siezed by metal or something. I would call a mechanic though and see what they say. There is a chance that the motor might have to be taken out to make sure something more serious hasn't happened.
I know this is all bad news but I may be wrong on the whole deal and maybe the pumps seals went bad and thats what caused it (hopefully) to fail.
-ed
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