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Old 12-04-2014, 05:50   #1
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Join Date: Jul 2011
Location: Presently in Rogersville, Al
Boat: Mainship 36 Dual Cabin
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Fuel Tanks - Portable

I bought 4 new fuel tanks recently. The typical Wally World 5 gal. plastic gas jugs so I can carry an emergency supply of about 16 gals.
I use gasoline. The new tanks do not have vents. Great idea, no fumes escape - initially. Looks like all of the fumes will escape at the same time when the tanks explode from the pressure inside. These things really bloat.
QUESTION: Is it safe to assume that there is some form of pressure relief if the internal pressure should get real high?

Mainship 36 DC - 1986
Retired and Full Time Cruising the Eastern U.S. inland Waterways
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Old 12-04-2014, 06:28   #2

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Re: Fuel Tanks - Portable

Good question. They keep making gasoline tanks worse and worse.

I remember when the Blintz "no spill" spout came out, You had to hook a little tab on the lip of whatever you were filling, then the gasoline would spill everywhere while you filled the item.

Never spilled a drop of a fossil fuel into the ocean until the "no spill" spout was developed.

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Old 12-04-2014, 07:06   #3
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Re: Fuel Tanks - Portable

Ours has a screw down fitting to seal it but you only want to seal it when you are moving it. If you leave the tank sealed, it will suck in the sides of the tank until it eventually starves the engine of fuel. If it gets hot it will bloat.

Once in place, you open the fitting so it is not longer sealed and can breath.

You shouldn't be putting the tank in an area that isn't properly ventilated.
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Old 12-04-2014, 07:24   #4
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Re: Fuel Tanks - Portable

Some of the newer portable containers have a vent built right into the spout, which means it only vents when you begin pouring gasoline. Storing gasoline in those containers in a confined space is a bad idea.
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Old 12-04-2014, 07:28   #5

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Re: Fuel Tanks - Portable

I don't think any 5 gallon jerry jugs have a built in pressure release valves.
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