[clewis]

I have a 1993 Mariner 115. It seems to be sucking down way to much fuel. It runs and idles great but running it 1 hour or so uses up about 10-12 gallons of fuel. Any ideas?

[Chris1956]

It would not be unusual for that motor to use 11 gal/hour at full throttle. if you run at less than full, it should use less fuel.

You might look for leaks in the fuel lines and leakage from the carbs. Chek to make sure all plugs are firing and they have a nice brown color.