ok So here is my situation. I pulled the intake off my B21FTI to replace the pcv valve, and found most of the wires to be bare.. it was so bad i moved the harness and the starter kicked in! So anyways.. i re-wire everything and it is all back in much better shape.

I go to start it.. turn the key to the #2 position expecting to hear my intake pump buzz.. and nothing. Turn the engine over and sure enough, it doesn't start. So i begin looking for what it may be.. (thinking i forgot to connect something..) but everything checks as being ok.. i don't think i could have done anything wrong so i don't want to pull the intake off again to re-do everything. After i go back and try to start again the main ful pump fuse (#7) blows. Only when i try to start the engine. Still no in-tank fuel pump noise either. I figure all my grounds are good, so i am lost. Tried another fuel pump relay out of my parts car.. does no good. I read 12 pages of posts on the brickboard and found one other similar post. It was determined to be a shorted out oxygen sensor heater element. Could this be my problem? My ox sensor is located in the downpipe.. and it's just a 1 wire sensor, so i am unsure. From what i have read if i jump a wire from #5-#7 my in-tank pump SHOULD run. So that's one thing i have left to try, but still why the blown fuse, is this due to a bad oxygen sensor?

The car ran fine when i parked it, so i am doubtful in the fuelpump being the cause.
Does anyone have any suggestions to what i can try? I just did an engine swap in this car, went from a b23E to B21fti.. but my old fuel system has worked with this engine up until now (i guess the only thing that stayed was the in-tank fuel pump, the rest of the wiring harness was completely switched).
I need help, i miss my volvo!