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You have a high risk of blowing up you boat.
You should securely tie the boat to the dock, get all passengers off the boat, turn everything off, and close all doors, hatches and windows, Then fuel up. After fueling, make sure there are no spills. open all doors and windows, and open the engine cover or hatch, check the bilge for spilled fuel and sniff fior fumes, run the engine room blower for five minutes, then start the engine, reboard passengers, and get ubderway
The boat could blow up. Gasoline fumes are very explosive. That is why boats are required by law to have ventilation for the engine room. If there are fumes and there is a spark from something electrical then the boat could explode. Always ventilate after fueling for at least 4 minutes, and make sure that electrical equipment on the boat is UL listed as ignition protected. That means it won't ignite any gas fumes. Always check for fumes with your nose before starting the engine.
Unusually nothing happens. BUT a build-up of fumes is possible under the right conditions. That along with an ignition source (engine starter motor etc..) can cause a catastrophic explosion. Use the blower while fueling and before starts IAW your owners manual.
When filling the fuel tank of a gasoline-powered boat, the safety precautions are:Keep engines, motors, and fans turned off,extinguish all open flame,ground the boat to the fueling dock where required.Discharge the static electricity. Before opening the cap, you should touch the skin of the vehicle and then touch something metal and unpainted attached to ground. If the fueling facility has a static line, use it.Keep your face away when opening the cap to avoid inhaling any of the fumes.Stay present while the fuel is pumping, do not use the fuel nozzle trigger lock.When fueling is finished replace the cap and the nozzle.Before re-entering the vessel, double check that this has been done.It is also a good idea to have a towel handy to wipe up any small spills.
Don't stand up in a small boat.
The rotors build up a static electric charge that has to be discharged before fueling to prevent a fire or explosion.
Prepare for the retrieval by making sure your crew know what to do and how to assist, set up the trailer before your turn on the ramp, conduct the retrieval efficiently, secure the boat on the trailer and then clear the ramp. Tidy up of the boat can then proceed in the car park area.
You need to ventilate your boat after refueling to disperse any build-up of flammable fumes - especially petrol (diesel is less dangerous). Any petrol fumes sinking into the bilges could be ignited by a spark from an electrical switch, or when smoking.
Make sure everyone on board is wearing a life jacket.
keep engines, motors, and fans turned off
Hold one ski up out of the water.