Do bravo outdrives have impellers in them or is there just a pump attached to the engine?

Thanks

Bravo Drives have no impeller in them. The Bravo set up has a Raw water pump on the side of the engine and also comes with a Circulating pump on the front of the engine (not to be confused with an automotive pump).

Hope that answers your question!

Mine has nothing other than the belt driven pump on the front of the engine I believe....

True there is no circulating pump on many hi performance motors, just a belt drivin pump with impeller. The circulating pump is bypassed.