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Old 06-08-2015   #1
Join Date: Aug 2006
Posts: 131
outboard motor gas tanks

Is there any special care for outboard motor gas tanks when not in use. Never used a motor before and would hate to smell gas from the tank when not in use. Is there a marine gas tank that would fit in a rocket box?

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Old 06-08-2015   #2
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Fraser, Colorado
Paddling Since: 2000
Join Date: Jan 2015
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Have you ever looked into propane outboards? I know they exist, and an extra propane tank is not that hard to rig, plus they are much quieter, and lack the nauseous fumes.

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Old 06-09-2015   #3
Join Date: Feb 2005
Posts: 883

Mattman has a nice idea, and there even are propane conversion kits for a lot of internal combustion engines. But it's a sort of specialized setup, and IIRC, propane-powered equipment is not as fuel-efficient as when operating on gasoline.

I've used standard three and six gallon tanks for fueling my outboards for years. They ordinarily have a vent screw of some type to account for expansion/contraction, and some small amount of vapor can escape that way. I don't recall it ever being particularly objectionable, because the what comes out dissipates pretty well in the open air. But different folks have different tolerance levels for that.

My tanks would not fit in a 20 mm rocket box, but they probably would go sideways in a 30 mm. rocket box. And of course, they would fit in a typical dry box. But if you are anticipating vapor release, you probably don't want everything in the box smelling like gas.


Rich Phillips
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Old 06-09-2015   #4
Custom Whitewater Equipme
Central Point, Oregon
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Propane sounds awesome but you get less energy out of it per capita. Take at look at the chart in the link below and compare BTU's

Gasoline gallon equivalent - Wikipedia, the free encyclopedia
May the water be under your boat and the wind at your back.
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