Just bought a WR400, that came with the IMS tank. I noticed it was having trouble getting fuel with a low tank (the fuel line wasn't full), but there was gas in the right side of the tank, where the petcock is. The fuel line goes up over the carb, which seems to make for an odd/difficult path for the fuel...does this have anything to do with it? another thing, when I kill the bike, and leave the petcock in the on position, it will start to leak fuel out of the overflow. If i turn the petcock off, it will stop leaking after a few seconds...what could this be from?