This could be the issue, tank pickup is in the rear
Fill as FT mentioned, then no need to crank just cycle key until fuel shows up without air. Fuel pressure gauge with drain tube is good for this, but can be done with screw driver
Yes but we are talking about heating, meaning cold temps
Below freezing Butane becomes useless
https://crazytroll.no/what-happens-if-butane-gets-cold/
If it'sof no use why use it
Don't know the motor but guessing it's not the block, there is probably either a gasket or a hose with a small hole/leak.
Most likely was done when the Bluetooth was replaced
Welcome
Transom is a lot of work and real dirty. While it could be your area that brings it to 20K, but get some other estimates.
Both motors need to come out, transoms removed and all the wood and fiberglass on the inside is removed. If stringers have also been compromised they to need to be...
Can do what I use to have done in my younger days, before matched pistons.
Weight all pistons and the use the lightest. Then drill out a bit of every other piston from underside to make all match
