Motor- Mercury 90hp 4-stroke, 2002

I could not get my motor started yesterday because of a fuel feed
problem (the spark plugs were dry, and the engine ran for a few seconds
when I squirted in Quick start).

I recollected that a mechanic once told me to disconnect what I now
know is the water temperature sensor. The motor started instantly.
How come ? What does the no start have to do with the water
temperature sensor ? Should I leave it unconnected?

AZ