ajwood,
i have had the same experience with my 019's before (i have 3)
the problem will be one of these things.
1 - Blocked oil gallery (use air compressor to blow out)
2 - Heat affected oil feed line (they go hard and brittle replace with new about $15)
3 - Blocked oil pickup in tank (air compressor again)
4 - Oil pump incorrectly inserted (the oil pump has a groove on it's side if you dont put the groove in the right spot it doesn't match up with oil gallery)
There is a little diagram on the bottom of the saw where the pump goes in, it shows the correct way to install it.
5 - Faulty drive gear behind clutch mechanism
Number 4 is my educated guess as to what is wrong with your saw.
I made the same mistake when i put an oil pump in my 019 once, very frustrating.
What is worse is that you just about have to completely dismantle the saw to correct the problem.
I have had my 019's apart so many times i can just about strip one down blindfolded.They are a good little saw if you maintain them often enough.
Feel free to ask for more advice if you need help.
