There should be a male style plug to connect that one with bare wires which will connect to your power source, then you need to figure the color code of the wires, typically black is the negative lead. Do not connect any live wires to a vented lead acid battery terminal though as the sparks could cause an explosion.
It is up to you to negotiate with the company so include fuel, oil, and maintenance, you will also have to keep a record of millage per trip per day with receipts. You can get guidelines from our friendly government revenue agency.
It's illegal to have a venting tank or cap on most ( newer) cars Greencoachdog many states and provinces test for this and the vehicle will not pass an emissions test.
If liquid is leaking out from the cap area then you simply have a defective tank or cap/gasket. If this is an engine that is used only on occasion then fuel should not sit in the tank or carb bowl for very long anyways as the fuel continues to degrade plus water will build up.
If the prop blades are fine then take it to a shop for expert opinion and get it repaired . You could also consider buying a new or rebuilt one as a spare.
Let's put it this way, if you had major damage you would have been dead in the water. But since you could move at a lower speed I would say 95% it's just the prop.
That it the only disadvantage with welding aluminum as it's considered a permanent repair but really it's just more work to cut grind fit and reweld which would make the repair costs rather expensive . And yes on a riveted design there are areas which should not be welded unless modified which is beyond the scope of most repair shops. Cracking issues at least where welds are concerned are more due to the process however modern TIG welding process and equipment have reduced the problem significantly.
Shane I think the shop has given you the best option but don't apply the epoxy without doing proper preparation of the aluminum first, that means cleaning the aluminum by removing paint and especially oxidation which is critical for a proper and lasting repair. If the rivets are loose they really should be reset before using epoxy otherwise you are wasting your time.
Tybo there are plenty of fully welded aluminum boats on the water with no issues. I have never found issues with welding aluminum except porosity due to contaminated welds.
Insurance will cover that IF insured.The spectators should have some sense not to be so close though, why breath in toxic fumes or try to out swim an exploding propane tank?
A permanent never leak repair is to remove the rivets and TIG or MIG weld the holes/seams. A cheaper low buck option not really recommended would be to braze or ultra low buck method that may work,less permanent would be to leave the rivets in place and solder them to seal.