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Location: Washington Well then, on a new boat the system has to be designed to meet the standard. Location: Washington You'll have to get a fuel tank that already has holes and fittings. Originally Posted by Ike You'll have to get a fuel tank that already has holes and fittings.
Location: Washington Thinking about it (your fuel system) you have what is called a Managed purge system or pressure relief system.
Yes, the cap has a spring loaded air release valve that allows pressure out, but no water in.
Originally Posted by Ike You may have to install an inlet valve in the fill line but other than that what you have may meet the standard Thank you.
Seems convenient, but at least I have a couple of decades of listening to the fuel fill hose to know when to stop. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. A fuel-polishing system, such as this one by Reverso, helps ensure engines get pure fuel, resulting in a clean burn and fewer problems. The great thing about efficient boats is obviously that they don’t use much fuel to reach your cruising destination. While Napurano generalizes that Reverso installs systems on boats from 40 to 80 feet, the size of the polisher actually has more to do with a boat’s fuel capacity than with its hull length.
One key to an effective polishing system installation is that it pick up the fuel as low as possible in the tank, which is where all the contamination accumulates. This article originally appeared in the February 2012 issue of Power & Motoryacht magazine.
When three major electronics companies roll out new radar technologies in the space of a month, there’s something going on. As a result of new EPA regulations to reduce evaporative emissions, portable fuel systems are now manufactured in such a way that prevents fuel vapor from escaping into the atmosphere. However, the EPA regulations present challenges to the marine industry because the compliant fuel systems are now sealed and unable to vent as in the past. Provided that all the other junk is hung correctly, this saves an extra fitting in the tank.

That cap you put on the fill allows the system to vent if and only if the system pressure exceeds 1 psi.
The downside is that they can leave a lot of unused, prone-to-contamination fuel in your tanks. He says that large, complex systems similar to those on commercial vessels might make sense on yachts longer than 90 but they are impractical for anything smaller. When a filter gets clogged on a boat without a polishing system, the fuel pump is starved, which can mean not only a burnt-up pump but an air-locked engine due to fuel starvation, or worse. For a 65-foot trawler carrying 2,000 gallons of fuel, Napurano recommends a 600-gph polishing system.
In addition to the environmental benefit, boaters see an economic benefit because their valuable fuel remains in the tank – instead of evaporating. The fact is, all systems sold today must not emit emissions and these new closed systems cause pressure build up inside the tank that rarely occurred prior to the new regulations.
Important improvements are being incorporated on the inside, that are not visible on the outside.Fuel systems in boats, even boats of fairly recent vintage, have more in common with those in 1930s-era automobiles. Companies such as Reverso Pumps, Algae-X, ESI Total Fuel Management, Gulf Coast Filters, Walker Engineering, and others offer their own versions but all of them essentially pump diesel fuel out of the tank, through a combination fuel-water separator and filter, and then back into the tank. Napurano says the best time to polish your fuel is right after filling the tanks when the fuel is agitated. Some people call these microbes algae but they’re actually bacteria, mold, and yeast. Many companies that build polishing systems use separators from well-known companies like Racor and Separ. The days of overflowing fills and vents will be a thing of the past on newer-model gasoline boats.
Whatever you call them, to keep them from clogging your fuel filters, you need to separate and then remove whatever water is in your fuel before the organisms can get a foothold.
Sediment and growth from the microorganisms that are resting on the bottom of the tank get stirred up during fueling.
Automatic Gas-Pump ShutoffBy model year 2013 (July 1, 2012), gasoline-powered boats will incorporate a more advanced fuel system designed and tested to activate the gas pump's automatic shutoff feature, eliminating overfilling. With debris and water dispersed throughout the tank, they get pulled more easily into the filters and out of your boat’s tank.

Though no one should leave a boat unattended while fueling, the new system takes the effort out of knowing when the boat is full. Part of this new design is a carbon canister tucked away in the boat's vent line and packed with a special marine-grade carbon. The carbon scrubs the hydrocarbons from the fuel vapor, eliminating fuel odors and contributing to cleaner air.
These components are mounted on top or in the tank and are precisely calibrated to make sure the tank fills to the proper level every time.
By reacting to the fuel level in the tank, the combination of valves sends liquid fuel up to the fill neck, activating the shutoff feature in the gasoline pump nozzle.
Ensuring a predetermined level in the tank eliminates traditional vent leakage from the fuel expanding due to the daily temperature rise.
This also protects the carbon canister located in the vent line from becoming saturated with liquid fuel.
Just like your car, this system can be overcome by repeated attempts to "top off" or using a very slow fill, such as from a jerry can.
The extra gallon is not worth the risk of having liquid fuel end up in areas that weren't designed for it.For now, these systems are not an aftermarket solution.
Rigorous industry standards, coupled with extensive manufacturer testing, have created a robust, dependable system that has different characteristics based on the model of the boat.Improvements For Small OutboardsNew EPA requirements for portable tanks are beginning to appear on the shelves.
An innovative self-sealing vent eliminates the need to constantly open and close the traditional screw fitting on the top of the cap. This feature eliminates the need to open and close the vent manually, ending the entrance of water through an open vent. This new technology vents at a predetermined level and even reacts to a vacuum situation, making the collapsed tank a thing of the past.

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