Join Date: Nov 2008
Location: Deale, MD
Thanked 46 Times in 46 Posts
Rep Power: 7
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
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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