Docsknotinn,
</font><font color="blue" class="small">( When you turn off the fuel and remove the filter there is still a very slow drizzle of fuel. )</font>
That sounds like a warranty issue. Fuel shut-off valves are expected to shut off the flow of fuel, not slow it.
</font><font color="blue" class="small">( 75 hours and one year on the original. It was just plain nasty with spots of rust and a lot of corrosion on the bottom. I had been using Power Service DFA. )</font>
Where are you buying the fuel? How are you storing it? Are you keeping the tank full in the winter?
To the best of my knowledge, there is nothing in the tractor's fuel system that could introduce rust or corrosion. That has to either be in the fuel when you buy it or come from your storage container.
I'm not trying to alarm you, but dirty fuel can be very annoying, particularly in cold weather. When it's cold and the fuel is thick, even a little dirt in the filter can bring things to a screeching halt.
Better to figure out what the problem is now than wait until it shuts you down.
Best,
Jim Fisher