I replaced my oil pump over the weekend while finally being able to replace the rear main seal. I bought a new high volume oil pump and took the pick up screen off of the old one and went to put it on the new one stuff begain falling out. Little plastic chunks fell out of the pick up screen so I shook all of it out and there was quite a bit that came out. The plastic pieces, some were black and some where white and were pretty decent in size. Sorry no pics, any ideas what this could be from?