I have a pioneer partner 500 that was given to me and it did not run. I now have it running but I am having problems with flooding. There are 4 lines that come out of the fuel tank and I am thinking someone has hooked one of the hose up wrong. The fuel pick up is fine and goes to the carb. There are two brass hoses in a rubber grommet that go into the fuel tank. The one brass hose has a line that leads to the exterior of the saw. The other brass hose has a line that goes to the tank vent. Is this the correct set up or is something wrong? I do not have a service manual and I am unsure what is going on. Thanks