Oil spits out of fuel pump screen

Fuel pump screen?

I have a Craftsman DLT4000 with an 18.5 B&S Intek Plus engine. The engine only has about 14 hours on it, but is about 3 years old. Over the weekend, it started smoking - oil burning blue smoke. When I turned the key off and got off the tractor, it kept running for about 30 seconds, puffing huge amounts of blue smoke.

After it cooled, I started it, and it still blew blue smoke, especially during drive or throttle changes. When looking at the engine more carefully, I noticed oil leaking out of the fuel pump (I'm guessing coming in through the vacuum line)... but the fuel pump seemed to work fine, as the engine still ran OK, just billowed smoke.

The only thing I did since then was an oil/filter change (SAE 30) and the oil coming out seemed to be OK (not overly thin, or smelling like gas, etc).

So, any ideas what could be forcing oil out the vacuum line for the pump? Or what could be getting oil into the combustion chamber? Especially on an engine with so few hours? Any suggestions as to where to start looking??

Thanks in advance!!