[Bobcat]

To elaborate a little on what Dean said about the power valve .... if it fails , the engine will run really rich . Where it will be the most noticeable is at idle with the engine running really rich and rough . If you take the metering block off and find fuel in the well behind the PV , it`s bad .
Another thing I`ve had happen is the gasket under the pv is a two piece gasket that is cemented ( ? ) together . If you tighten the pv too much , the gasket will separate and give the fuel a sneak path to screw you up . When you take the pv off , the gasket will actually be in two pieces .