Car

If "oumo" is code for pump then its pretty safe to say your fuel pump has failed. It could be a wiring or fuse issue, but most likely its the pump. Check your owner's manual for location of any fuses or relays and check them first. If you're taking it to a shop they will do a proper diagnosis before replacing things. If you're doing it yourself, be sure to change the fuel filter at the same time.

Fuel pump was not coming on. The car would turn over but not start. We changed the full pull and it still won't prime. And now something is draining my battery.

Check that a light hasn't been left on while working on the car. Have the battery load tested to make sure it's still good. After that it sounds like you're looking for an electrical problem. You'll likely need professional help for that.