I have a 2000 pete 379 for the past 2 weeks I've been having issues where the tanks do not equalize left tank empties faster than the right. I have replaced the vents, splitter valve, fuel lines. I'm to the point where I have to shut the valve and run with one tank. I've checked the tanks and they seem to be pretty clear of any debris or algae. Any one else who may have an idea of what it could possibly be?