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Fuel Tanks

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Boating Know How

Low Permeation Portable Gas Tank

Back in October of 2008, the Environmental Protection Agency came out with a new ordinance that affects the way gas systems and their parts are made. All gas containers are required to meet the evaporative emission standards specified in 40 CFR 1045.112. ... read more

Boat Fuel Tank

The new requirements for are as follows:
  1. A reduced permeation rate on portable gas tanks (1.5g/m2/per day).
  2. A reduction of gas vapor from the vented cap on the tank (New cap design required).
Moeller's portable gas tank designs are certified for the reduced permeation rate. They were able to achieve this by introducing an additive during the molding process. Now the they are certified to both the ABYC (American Boat and Yacht Council) and USCG (United States Coast Guard) requirements as well.

Moeller has also designed a new vent cap to help meet the requirements as indicate above. The new requirements states that caps must have a tether, there must also be an audible "click" letting you know that the cap is on tightly, to seal up to 5 PSI out, allow vacuum in, an external means to temporarily relieve pressure within the tank prior to you filling or connecting back to the engine and in storage mode. All these upgrades are in place to help seal the tank and not allow it to vent.

The changes that Moeller has made in their line of portable gas tanks has helped keep them in the front of the pack in the marine industry. They are amazing products.

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Ethanol can be a Problem for your Marine Engine (Video)

A video presentation on how Ethanol can be a problem for your marine engine, presented by Yamaha. ... read more

Video Transcript

This morning were going to show ethanol gasoline and the effects of what atmospheric air does to it. As you can see there is no water in this gas, just a standard gas sample out of a vessel we pulled this morning. What we are going to do is we are going to subject it to a fan. Basically what we are subjecting a vessel to is an open vent running out of water. What we are going to do is put this gas maybe 5 feet from a fan. It will be simulating what we are doing is running under water at 40 mile air, 35 mile air. What we’ll see is in about 10 – 15 minutes this gas is going to start actually making its own water, simulating what a vent does to a gas system.

Okay here we already have the effects starting, we can see the moisture rolling down the outside of the glass. It’s been 2 minutes since the fan has been on. Again simulating the effects of a bout running under water. In our automobile we don’t have this issue because our systems are sealed until the engine is running and the purge valve open. The tank is totally sealed. In our's, it is not. The water droplets you see running down the outside of the glass are basically what is pulling humidity out of the air. We can also see the outside of the glass condensing. Basically that’s the alcohol causing the coldness, causing the glass to condense. Our old gas would not do this because it did not have the alcohol in it. This gas having alcohol is a water attractor.

Okay this is after 1 hour of having a fan on this gas. You can see that in this bottom corner we have accumulated probably an ounce to ounce and a half of water already. We are dealing with 16 ounces of gas to 1 ounce of water already. Where in a tank with 20 gallons you know the accumulation is going to be doubled. And you can see we have condensation from the outside of the glass from the ethanol and if I wipe that off you’ll probably get a better view of the water. And I think you can probably get that on the camera.

Basically what we are looking at here is this is the effect that ethanol can have on your gas. So again the manufacturers right now are recommending put enough gas in that you can us for the day, which goes against everything we have learnt in the past of keeping the gas tank full. But keeping the gas tank full is not going to stop this, what it’s going to do is drop the water an ethanol in the bottom, the petroleum goes to the top. The petroleum will evaporate making room for more water. So again put in the tank what we can use. Also we want to use our ethanol stabilizer and Startron is what we are recommending right now. And basically we are trying to take this effect out of the gas.
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