My 2004 Virage wasn't using any oil last summer so I started mixing oil with the gas. During the winter I bought and installed a new oil pump. It still isn't using any oil from the tank. I think the pump is working because if I remove the oil hose from the carburator and put it in a container it pumps oil into the container. When I hook it back up to the engine and ride the oil level in the oil tank doesn't move. I'm not depending on the guage, I actually marked the oil level in the tank, 2-3 hours and 10 gallons of gas later it is still the same. Is there someting else I should be looking at? Plugged passage in the carb?