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Dump the contents of the fuel filter into a clear container. If there is anything other then clean gas. Most likely filter will have some crud in it. Might even be clogging up

If you use compressed air do remove the gas cap. Tanks should not have any more then 3 psi. You can you 90 psi so long as the cap has been removed

You mentioned this boat has outdrices? 1st post If it does then all you need is what is on the drives. Start there and measure voltages. That said the boat needs to sit in the water connected to shore power for at least 24 hours prior to measuring

Key OFF means you have to turn the motor OFF to get the drive out of gear. The Alpha drive clutch must be unloaded to shift into neutral, just the way its made.

With the carb dripping fuel then its shutting down from flooding. For this to happen the float is not set correctly, the float is to heavy and is sinking, a piece or crud got in the needle seat, the needle seat is bad or there is to much fuel pressure

Don't see an issue with running lean The motor might be dying because the shift interruptor switch is hanging or mis-adjusted. The interruptor makes the distributor miss to allow the clutch in the drive to unload so it can be moved into neutral. If it hangs or not adjusted correctly the motor...

Yes

I'm finding there are 4 hex bolts which hold the pump to balancer Finding part number 3587445 which is NLA. Its sold in a kit 22125080 Finding there are 3 Allen heads holding the pump body parts 3857939...

Does it start right back up easy?

If unable to get to something on a motor that needs replacing, you have to remove things to get to it, or pull the motor. If you have closed cooling it would have AF so would need to drain heat exchanger prior

Think you have the TKS carb oil pressure switch and is part of manual 41 Block diagram of how its used

Motor manual is number 7 Drive is manual is number 6

Depends on the throttle control design. Many Mercs the button looks like part of the panel mount. Look close at the bottom right corner to see if its rubber and not plastic. If its rubber push real hard, that would be the trailer switch If not post pic of your control

The serial number shows TB4 ignition Run thru the troubleshooting guide (the TB4 and TB5 are the same)

In most cases yes, so long as its not running lean A motor will run great when running lean. The lean condition will damage the motor. It probably is not running lean but you can do a simple check. Run motor at WOT or close to WOT for a few minutes. Slow down and don't idle much at all and...

Brass/Bronze its a thru hull Don't see 8 more like 12 http://stevedmarineconsulting.com/wp-content/uploads/2014/03/BondingSystems138_05.pdf

Check fuel pump pressure Need to get a gauge to read 4-7 psi and place between pump and carb. Its either running out of gas due to a bad/weak pump or drawing a vacuum due to antisiphon valve, would be my guess

Inboards use transom zinc, I/O don't because they need them on the drive Yes there should be ground wires on brass thru hulls, and it should also have a galvanic isolator. But being on a lift the isolator will not be used

I remove the drive and place on a stand at the end of every season. Helps with checking gimbal, boot and joints. Also big help with boots because they are in a relaxed position, they last much longer this way

The vent is either part of the cap or right next to it