I have a 2008 3700sy maxum and about a month ago I notice the throttles split getting larger between the two. Now last week I took a trip and where I burnt maybe an 1/8th of a tank on the strbd engine I burnt a 1/2 a tank on the port eng. I have the 8.1ho engines in the boat, now back in May 2010 I bent the port side prop. The marina I have my boat at did all the work as far straightening the prop. Don't know what to look for. There was no fuel in the oil, or bildge area. No fuel leaking around engine nothing coming out of vents. All the guagues were pretty close to the same on both engines.