2005 VMAX 150 Fuel consumption

[Lagunaholic]

Starting to see increased fuel usage. Any ideas?
Also, anyone know where to get good service manuals?

Thanks in advance,
Steve

[boats.net]

Check compression, may need to run some Ring Free through it to clean carbon from rings, check fuel system for leaks or ruptured fuel pump diaphrams, check cooling system is keeping engine at normal operating tempature, check condition of prop, check condition of boat hull.
Use a non Ethanol gas to get better mileage.
Can get Yamaha manuals at http://www.yamahapubs.com/index.do?pg=search&category=4