Why must you operate the exhaust blower before starting a boat's inboard gasoline engine?

You must operate the exhaust blower before starting a boats inboard gasoline engine to remove fuel vapors.

If you have not started the boat for some time, inspect the boat first before running to check if there is any problem. Sometimes we thought there is small problem but later it can cause a big problem.

So you must look for the engine, fuel etc. these are all the precautionary steps for our safety.