I only have 25 miles on my bike, but it's a similar deal -- there always seems to be some in the line, maybe 3/4 full, but it just seems to trickle, or maybe even just drip into the line from the tank.
Good luck with your exams. Geez, sure wish I could have had an MBc for commuting the 16 miles each way to school when I was at Simon Fraser. Where did my student loans go? Oh, yeah -- gas and parking for my guzzling '76 Firebird!