Storing fuel in EPA compliant fuel tank

Old 07-09-2019, 05:29 PM
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Question Storing fuel in EPA compliant fuel tank

I'm installing a second 6 gallon portable tank on my Bass Tracker Heritage edition. Now, these cockamamie EPA tanks are going to be the death of me. After screwing up my former boat with ethanol, now they're trying to blow up my boat with a sealed tank of flammable liquid. (I know they aren't, but I wanted to kvetch for a minute. I'm irked to even be thinking about this.)

I store gas on the boat with the line connected which has a fuel demand valve in the first tank. I'm installing this second tank and was planning to just disconnect the fuel line at the tank (sprayless connector) to swap tanks. But, if I have the second tank full of fuel on the boat when it's not being used, will the pressure build too high without the fuel hose and fuel demand valve connected? Does the tank need to have the fuel demand valve connected even when not being used in order to relieve pressure?

I'm sure I'm overthinking this, but last thing I want is to do is have the tank split and 6 gallons of fuel in my bilge or in my driveway. I'm bugged by the lack of real documentation on these tanks, the new connectors, the fuel demand valve, and how this half-baked idea is all supposed to work. (And how did Attwood get the exclusive on making these connectors and valves??!! I smell a conspiracy...)

Thank you for the informed advice.

sporteus is offline  
Old 07-11-2019, 08:10 AM
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the fuel demand valve doesn't relieve the tank from swelling, just the opposite -

it prevents pressure in the tank from pushing gas out the hose to the engine -
unless there is 'demand' on the engine side of the demand valve.

The tank cap is designed to eventually release pressure,
but not until it exceeds 5 PSI.

4.999 PSI can 'bloat' the tank considerably,
but supposedly the tanks are 'rated' to withstand up to 15 psi.

Last edited by Fwpratt; 07-11-2019 at 02:08 PM.
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Old 07-11-2019, 09:11 AM
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Cut the bladder on the vent.
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Old 07-11-2019, 01:32 PM
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I used Attwood plastic gasoline tanks for years in my old skiff with the cap vent closed when the tank was not being used. Yep, they swelled (swole) up like footballs when not being used. Never hurt them a lick.
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Old 07-11-2019, 01:34 PM
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I have an Atwood 6 gallon tank that is now permanently the shape of a football. My advice is stay away from this brand. Might not hurt them, but not exactly what you want in a boat. I just use it to store gas in the garage for the generator.
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Old 07-11-2019, 04:43 PM
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Thank you. That helps. As long as something on the tank will release pressure at some point, it should be good.

Thank you.
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Old 07-12-2019, 09:38 PM
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Yes, the sealed fuel tanks will swell as the gas inside heats up, but I have never seen or heard of a catastrophic failure. I know it LOOKS scary, but it's ok.

The way to minimize (not eliminate) the swelling is to vent the tank as it gets hot the first few times. (Just don't tell the EPA.) Basically what you want to do is remove as much air as possible, and leave the tank full of gasoline vapor. That will reduce the total pressure.

If you think about it, we have stored gasoline in totally sealed, and unvented, plastic jerry jugs forever. We don't notice the bulging on those because it is the sides that bow out, not the top and bottom. Same pressure, same material of construction. It is just less obvious.
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