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Old 04-15-2013
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outboard fuel tank

Are the fuel tanks with the vent on the fill cap now ilegal? (EPA Ruling)
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Old 04-15-2013
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Re: outboard fuel tank

How can you possibly get the fuel out of a tank without a vent of some sort?
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Old 04-15-2013
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Re: outboard fuel tank

They are trying like hell for diurnal fuel tank emissions vents on installed tanks but the reality that a boat fuel system has different safety issues is slowing it down

On portable tanks so far they have just done self closing spouts that ensure you spill the most possible fuel while using them
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Old 04-15-2013
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outboard fuel tank

The new tanks at WM will allow the tank to pressurize up to 5 psig I think without letting it vent. It will keep the tank from drawing a vacuum. This info is off a WM video.
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Old 04-15-2013
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Re: outboard fuel tank

Yes, this from the Federal Register:

eCFR — Code of Federal Regulations

(c) Portable marine fuel tanks and associated fuel-system components must meet the following requirements:

(1) They must be self-sealing when detached from the engines. The tanks may not vent to the atmosphere when attached to an engine. An integrated or external manually activated device may be included in the fuel tank design to temporarily relieve pressure before refueling or connecting the fuel tank to the engine. However, the default setting for such a vent must be consistent with the requirement in paragraph (c)(2) of this section.

(2) They must remain sealed up to a positive pressure of 24.5 kPa (3.5 psig); however, they may contain air inlets that open when there is a vacuum pressure inside the tank. Such fuel tanks may not contain air outlets that vent to the atmosphere at pressures below 34.5 kPa (5.0 psig).


I'm not sure any percieved benifit off sets potencial safety issues for these small tanks, but it is true.

Installed tanks can vent though carbon canisters. Based on quite a bit of personal testing, I think this actually benifits the boater, if the design is good. The canisters reduce fuel loss by several gallons per year (both $$ and preserving the most volitile fraction), improve fuel oxidation stability (less oxygen), reduce water absorption (important for e10), and reduce fuel system (carb) corrosion; I've been able to reproduce these benifits in the lab and on the water.

Sail Delmarva: Gasoline and Fuel Tank Vent Filters
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outboard fuel tank

So what's the penalty if you get caught out there with the external vented tank?
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Re: outboard fuel tank

Its a going forward standard that does not affect old installs

I have sure not seen a portable 3 or 6 gallon tank that does well with 5 PSI ?

Even my best CARB compliant plastic tank has fits within the confines of my fuel tank friendly garage and it would seem the old school metal tanks would be far more up to the task of containing the pressure fluxuations


I find the fact that they phased out the "outdated" station recovery systems rather absurd as it is when by far when I smell the most fumes but we spent a large fortune on that failed experiment
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Re: outboard fuel tank

I've been using one of the new 3 gal tanks for 9 months now - it seems to work just fine.
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