QUESTIONS? 1 800 675-2076

Our Offerings

Fuel Tanks

Why choose a BluSkies fuel tank?

  • Proprietary barrier material used in a 3 layer sandwich technology for superior strength and durability
  • Proprietary hydrocarbon barrier system is based upon EPA “certified by design” technology
  • Cross-link exterior meets USCG/ABYC H-24 burn test requirements
  • Standard tank sizes have 5 positions (72 degrees) for component direction that allow for multiple installation applications
  • Compliant direct fill “plug and play” complete systems available on standard size transom/pod fuel tanks

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Fuel Systems

Emissions, Refueling and Vapor Management

Based Current EPA / ABYC regulations and standards are requiring OE boat builders to change their fuel system(s) design and function.  When designing a fuel system to meet EPA / ABYC regulations and standards the fuel system must perform the following functions:

    1. Fuel vapors (emissions) created by a marine fuel system cannot migrate through the venting system unfettered to atmosphere.
    2. Marine fuel systems must prevent fuel from entering or remaining in areas where low permeation materials are not used.
    3. Marine fuel systems must prevent refueling “spit-back” and tank “well-back”.
    4. Marine fuel systems must provide an audible or visual signal of system closure.
    5. Marine fuel systems must allow for vapor venting during boat slanting or sloping when stored, moored, parked or trailered

The majority of the items above relate to fuel vapors (emissions) created by a fuel system during the diurnal temperature cycle.  If the diurnal temperature cycle creates sufficient heat in a fuel tank to cause the temperature of gasoline to rise, therefore creating fuel expansion and vaporization up to a rate of approximately 5%.

There are two basic approaches to managing fuel vapors created by a fuel system.

    1. Managing fuel vapors with a “Passive Purge” system.  A “Passive Purge” system utilizes a charcoal filled canister (carbon canister) designed into the fuel system to capture fuel vapors (emissions) during diurnal venting prior to being vented off to atmosphere.
    2. Managing fuel vapors with a “Managed Purge” system.  A “Managed Purge” system incorporates pressure release valving into the fuel system to release fuel vapors (emissions) to atmosphere during diurnal venting at ~1PSIG (~2inHG).

Both of the above options to managing fuel vapors create a small pressure (or back pressure) build up during peak diurnal temperatures and both options require an EPA issued diurnal “Certificate of Compliance”.
Once you have decided which method to use for managing fuel vapors, then you need to validate that your fuel system design will: upon completion of refueling maintain a vapor (ullage) space of ~5%; eliminate the propensity for refueling “spit-back” and tank “well-back”;  provides for vapor venting during boat slanting or sloping when stored, moored, parked or trailered.
In deciding on which system type is best for your application, one should take into account fuel tank type and configuration; boat space available to mount added components and the likely environment in which the boat will operate and be stored.
BluSkies has commercialized a series of vapor space control technologies that can be used with both methods of managing fuel vapors with either deck (remote) fill or direct fill applications. 
Call BluSkies so we can help design the appropriate, cost effective fuel system for your specific application.

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Fuel System Design & Validation Services

As a single source for both fuel tanks and fuel systems, BluSkies is able to provide one of the marine industry's most comprehensive validation and compliant fuel capacity optimization services.

BluSkies comprehensive evaluations include the following value-added services:

  1. Computer simulation modeling validation to ensure that each fuel systems operational design criteria meets the Environmental Protection Agency (EPA) CFR40 Parts 1060 design intent. Including but not limited to refueling, fuel intrusion to system non-low permeation areas, water intrusion that could potentially defeat compliance of system components, etc.
  2. Validation that each system meets American Boat & Yacht Council (ABYC) H-24 tilt study and venting protocols including system safety and functional design standards.
  3. Calculation of tank and system capacity, identification and indication of optimum fuel vent placement to maximize capacity with minimal or zero deck modification or vessel structural intrusion.

NOTE: BluSkies provides all of the these services at no cost to the boat builder nor does it require contractual obligations or require vessel fleet commitment to qualify.

For a custom fuel tank/system validation evaluation

  1. Email your drawing(s) in 3D format (IGES, STEP or Solid-works) to: 
  2. Email or fax your drawing(s) in 2D format to:  or FAX 1-800-675-2076
  3. Download and fill out the form  BluSkies Diurnal Report Request Form and email or fax it to:  or FAX 1-800-675-2076

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Fuel System Components


BluSkies patented “ullage valves” provide 3 key functions for a compliant marine fuel system.

The primary function is to drive fuel up the fill hose to activate the automatic fuel nozzle shut off during refueling.

Their secondary function is to maintain an exact expansion space within installed marine fuel tanks, this space allowing for fuel expansion during diurnal temperate rises and protecting sensitive system components from contamination.

Lastly they provide adequate venting for vessels to meet ABYC H-24 Standards.

*All BluSkies valve components are approved for use with passive purge and managed purge systems.


Available in a variety of composite and stainless steel combinations for use with gasoline, diesel, water and waste. Available in straight, 30 degree and 15 degree. Gasoline version meet or exceed all EPA, CARB, ABYC regulations and standards. Gasoline versions are EPA certified and can be used to comply with diurnal mandates outlined in 40CFR Parts 1060.


  • Designed to meet stringent CARB and EPA Requirements 
  • Superior efficient use of Carbon Bed to allow for OE packaged smaller canisters
  • Canisters and Ports can be Designed/Configured to meet your specific needs
  • Carbon Canisters are designed to be compatible with the harsh marine environment 


The accessory items BluSkies offers are critical miscellaneous items needed to build a complete compliant system. Additional versions/styles/sizes of the items discussed or shown herein are also available, call 800 675-2076 for components needed for your particular system application but not listed.

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