If you have an oil leak on the top of a 93 lumina 3.1 motor Not valve cover gaskets you think it has to do with the oil pump Is there a drive unit on the top of the motor?

This is a very common problem on these engines after they get some miles on them. If you look below the throttle body you'll see the oil pump drive housing in the block. It is bolted in with one bolt and a bracket. There is a rubber o-ring that seals it and this gets dried out and worn and needs to be replaced. On the plus side, the seal only costs $1. You'll need to remove the throttle body and remove/loosen the fuel lines. This is to gain access to pull the shaft out. Remove the single bolt and bracket holding the housing in. Using some pliers pull straight up on the housing. You may have to "wiggle" it a little. Remove the seal, install the new one and reverse the removal procedure. That should solve your oil leak.