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Gasoline vapours are heavier than air. Every precaution must be taken to prevent them from entering the boat and settling into the bilge (the lowest inside part of the hull). Any vapours that do get into the bilge must be removed by the bilge blower, before the engine is started or electrical devices are turned on. Otherwise, a spark or open flame will detonate gasoline vapours.
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Above, sunken vessel & burnt gas-dock
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Always practice the following fuelling precautions;
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Ontario Boating League
8 - 63 Main St.
PO Box 5085
Penetanguishene ON
L9M 2G3
Phone: (705) 549-6500
Fax: (705) 549-6463
Emergency: (705) 528-9927
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Before Fuelling;
make sure the boat is tied securely,
shut down all engines, motors, fans and appliances,
extinguish all open flames (stove & heater pilot-lights etc.),
close all doors, hatches, and ports (windows), so vapours do not blow in and below,
move portable fuel tanks ashore for filling (they are not vented overboard, like a built-in fuel tank is),
have all persons that are not required for fuelling, go ashore,
do not allow smoking nearby.
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While Fuelling;
keep the fuel nozzle (or can spout) in contact with the fill opening - to prevent a static spark!
do not overfill, allow for fuel expansion on hot days - so it doesn't overflow out of the vent. (especially important if you fill-up when you return to the dock)
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After Fuelling;
close fill opening(s) - it's often hard to find a correct size replacement cap, if it's left at the dock!
wipe up any spillage, dispose of wipers ashore. (report fuel spills to the Coast Guard - if you require containment help),
open all doors, hatches & ports,
turn on the bilge exhaust-blower, allow it to run for a minimum of 4 minutes before starting engine(s),
use your nose to detect any fuel low down in the fuel and engine compartments. (only start engines when you are sure no vapours are present).
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The bilge exhaust blower is like a vacuum cleaner, sucking any explosive vapours from inside the bottom of the boat, and sending them safely outside.
A note about blower hoses: On older boats, the hoses are often cracked or separated in places not easily seen. If the blower is not drawing air from the lowest part of the bilge, it's not doing its job. Explosive vapours may remain - no matter how long you run it. It's well worth the time & money to have them carefully checked & replaced if they are bad!
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Carbon Monoxide (CO) - the silent killer!
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Carbon Monoxide is produced whenever there is combustion (from an engine or generator, hibachi, gas-stove, kerosene heater, etc),
Silent, because it is odourless and colourless,
Deadly, because it is a very poisonous gas.
Never run an engine or generator while people are swimming nearby, or on the swim platform. CO has been known to waft into the cockpit or sleeping areas (through open rear hatches) while underway.
early symptoms of CO poisoning are similar to flu symptoms,
CO detectors are not a sure defence - always make sure that the area you and your guests occupy is well ventilated,
if CO poisoning is at all suspected, get to fresh air immediately.
Click on the Picture at right to find out more about CO poisoning. Courtesy of the CDC (Centers for Disease Control & Prevention)
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