Good Sam Community

Make sure your battery is fully charged and if there is something that is going to draw it down over the winter, disconnect it

I've found making a checklist for packing up is a good idea too as it is very easy to overlook little items like this

I would bet that the vent pipe runs into the top of the tank through a rubber grommet that seals it, and the pipe has dropped down into the tank too far and could be resting on the bottom of the tank, or just low enough that the bottom end of it is u...

would need to do a wet/dry compression test, where you would squirt some oil into the low cylinder and perform the test again. If the compression comes back up, it is usually and indication that the rings are not sealing.