Ayuh,..... There used to be only 3 options,....
With electronic motors, they keep adding more, 'n more sensors,......
Also, be sure the wiring for the sensors are clean, secure, 'n pass current properly,.....
Ayuh,.... To many variables,... If the motor will drag on the ground if left down, of course, that's not an option,....
If ya tow with it tilted, Yes, it's gotta be secured in that position, with whatever works in yer situation,.....
Ayuh,..... But, they come with 2 different filter thread pitches,.....
Mercruiser, 'n Volvo,......
The one you posted doesn't say,....
The Merc housing uses a Napa 3225, or 3226 filter,.....
Ayuh,..... Welcome Aboard,.... A leak down test is done by bringing each cylinder to it's Tdc, 'n blowin' compressed air in through the spark plug hole,.....
If you hear the air through the carb, it's an intake valve,.....
If you hear the air from the exhaust, it's an exhaust valve...
Ayuh,..... That can happen,......
Instead of Teein' the line, install a Merc pattern canister fuel filter, 'n use it's second "out" port,.....
That way, both motors are fed cleaner fuel,....
Ayuh,.... It should be yellowish clear, aka: tygon,....
It goes to a nipple on the carb, or flame arrester to dump down the throat of the carb, if the fuel pump diaphragm ruptures,....
Being clearish, you can notice the gas in it, before total failure,....
Ayuh,..... I can't make heads or tails of this post,.......
Yes, there should be a wire from the outer tiny terminal on the starter's solenoid, to the coil's (+) terminal, to by-pass the ignition circuit, while starting,....
On newer motors it would be purple/ red stripe,....
Ayuh,....... The 470 has many varied potential "Issues",.....
Keep the raw water pump impeller changed every other year,.....
The 470 will Not stand an overheat,.....
Ayuh,..... The DP-SM is a pretty stout drive, 'n unless abused, I believe you'll be happy with the package,......
Deal with a machine shop you can trust,.....
The stroke is a 1/4" longer, so no outside the block tell-tales,....
Ayuh,.... Welcome Aboard,...... Please read, 'n follow our posting rules, 'n guidelines,......
Threads older than 90 days, are antiques, 'n only the original posters are allowed to bring 'em back to the top,......
Start a thread of yer own, 'n help will follow,....