I was installing a coolant overflow bottle today, working right next to the intake manifold.  Kept smelling gas.  Then I noticed a little puddle inside the little depression formed by a modification I just added.  The new fiberglass didn't have any paint on it, so that is why I could see through it.  There was maybe an ounce of gas floating around in the bottom of the manifold.

Could I have been running so rich during my test run that  an oz of gas was left on the manifold walls?  Or could it be that it dripped through a leaky injector, even though I shut down by switching off the fuel pump in order to relieve line pressure?

I know some others have had problems with leaky injectors.  Does anyone have an idea for making them not quite so leaky?