Referring to can attached to air pump, not the coffee can vacuum accumulator btw

What does it do? And it has a hose out the other end that isn't connected up to anything?

 

It's a silencer. A muffler for your air pump.

 

It's the 2ndry air intake filter. The open hose is the fresh-air intake.

 

So, is there a filter element inside the can? Any maintenance protocol for this...

How do I verify pump is working? Thanks

 

YesNo, but you should read the maintenance schedule for yourself so you know what's on it.

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Look at the pulley while the engine is running. If it's spinning with the belt, and not making unusual noises, and the CEL isn't on, it's working. Read this page & the NEXT few:

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