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. Upgradethis site. EPA Wavier for Small Builders Visit Perko.com Overview Partners System Design Overview Tanks Typical Systems NMMA Tests Components Carbon Canister Overview Ordering Information Fuel Fills Overview Replacement Caps Vents Valves Pressure Limiting Valve Fuel Demand Valves Tank Vent Valves Fill Limit Valves Inlet Check Valves Diesel Shut Off SystemAir/Fuel Separator Other Components Installation Regulations EPA CARB E P A COMPLIANT COMPONENTS View all Components Perko Carbon Canister Carbon canisters filter hydrocarbons out of fumes vented during thermal expansion and/or refueling of tanks. Canisters are then purged when fresh air is drawn into the tank during thermal contraction or while the engine is running. More Information Prevent Fuel Back Splash ICVs are used to help prevent wellback (the reverse flow of fuel out the fill after refueling is completed) & spitback. These normally closed valves are opened by the presence of fuel running down the fill pipe during refueling. More Information Overview Perko has been manufacturing fuel system components since 1936 when we introduced our first fuel filter. Since then we have manufactured various types of fuel filters, fuel water separators, fuel system vents, fuel fills and caps and the fuel system product we are best known for, our combination fill vent. Now we have expanded our line to help boat builders properly and safely comply with new diurnal emissions regulations. Our expanded line now includes carbon canisters and specialized fuel system valves. To assure safe, competitive quality components, we have partnered with experienced automotive suppliers of these components with proven records of design and quality. Together we have worked to tailor their proven designs to best fit the needs of boat builders. BorgWarner (formerly Delphi) has been manufacturing automotive carbon canisters for over 40 years. Raval has been manufacturing tank vent valves for over 10 years. Both work to automotive quality standards for fuel systems. With these new partners, we are working to provide boat builders with the right solution to reduce diurnal emissions for each model boat they build. Download Components Brochure Latest Press Release Perko Guides Replacement Gas Cap Choices November 17, 2014 9:51 am During the heat of the day, a boat’s fuel tank can warm and the liquid within it expand. This built-up pressure used to be vented off through fittings. But in 2011, the US Environmental Protection Agency (EPA) mandated that fuel systems on new boats be sealed to protect air quality from hydrocarbon emissions. Perko has responded with its full line of EPA-compliant, replacement sealed gas caps with built-in vacuum over pressure relief (VOPR), each proudly made in the USA. Whether it falls overboard at the fuel dock or has simply lost its lustrous shine, it’s important for boat owners to know what type of system they have to correctly select the proper cap. The company’s packaging makes selecting the right model easy: blue is for pre-2011 vented systems and green is for post-2011 sealed designs. Using the wrong cap can be dangerous to both the boater and the environment. A sealed version on a vented system may cause a tank to over-pressurize and create... View all press releases Our System Partners We have partnered with industry leaders BorgWarner and RAVAL to deliver the best diurnal marine components. View All Components Featured Components Carbon Canister Inlet Check Valves EPA Fuel Fills Now ISO 9001: 2015 Certified Perko Emissions Catalog Contact Us 16490 NW 13th Avenue Miami, Florida 33169-5707 Phone : 305.621.7525 Fax : 305.620.9978 © 2021 Perko Inc. - Diurnal Control Emissions Systems LOGGED OUT Partners System Design Components Installation Regulations Press × Login to Private Area Login E-Mail * Password * Close...