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eVaptive electronic venting system

eVaptive is Eaton’s electronically controlled fuel tank vapor venting system that can be optimized for any vehicle platform, eliminating the need to design unique venting systems for different vehicles. 

Reduced complexity
One set of hardware across multiple vehicle platforms
Flexible application
Works in naturally aspirated, boosted, and hybrid powertrains
Enhanced onboard diagnostics
Enables more detailed system and sub-system monitoring

What is eVaptive?

eVaptive is an electronically controlled vapor venting system that transmits fuel vapors to a charcoal canister while keeping liquid fuel confined to the fuel tank. For any given fuel tank application, the system can be optimized for all driving situations as well as stationary and refueling modes. The hardware is a “one-size-fits-all” unit that can be programmed to fit any vehicle platform, eliminating the need for OEMs to design unique venting systems for different vehicles.

How it Works

In a traditional fuel tank design, and according to OEM requirements, optimal vapor venting positions are determined in the vapor space at the top of the tank. Once these vent points are determined, Eaton’s eVaptive™ Electronic Venting System vent positions can be located there. Any liquid fuel that enters the vent tubes is routed to a central liquid trap, where it is pumped back into the fuel tank. Once vapor is routed to the charcoal canister for absorption. 

The actuator system is controlled by a computer algoithm that controls the fuel level during refueling. It also is used to mitigate the spit-back that sometimes occurs when filing the tank to full volume. 

Eaton eVaptive fuel tank configuration

Eaton eVaptive tank detailed

Learn more about eVaptive

Key Features 

  • Reduced complexity and cost by allowing customers to use one set of hardware across all vehicle lines and tank variants
  • Prevents liquid from leaving the tank when driving while still venting vapors
  • Reduces validation cycles and development time
  • Adaptive learning optimizes the eVaptive system venting algorithm
  • Maintains overall lower tank pressures in dynamic situation and at high-fuel levels
  • Not impacted by shut-off height of mechanical valves
  • Enables On-Board Diagnostics II (OBD) leak detection to ensure no hydrocarbons are escaping into the atmosphere
  • Ability to customize the pressure relief of the fuel tank needed just prior to a refueling event on plug-in hybrid electric vehicle applications


Benefits of eVaptive

Reduced complexity/cost

Design flexibility

  • Fewer vent points
  • No longer impacted by the open and closed positions of traditional refueling vent valve (FLVV) float mechanism
  • The liquid trap may be mounted on the top or bottom of a fuel tank

One set of hardware across vehicle lines and tank variants

  • Reduces development time
  • Economies of scale realized
  • Reduces validation cycles

Liquid/Vapor Separation

Eliminates liquid carryover from the fuel tank utilizing:

  • A liquid trap depository 
  • An over pressure relief valve for a power-off or emergency situation
  • An optimized vent algorithm

Superior dynamic vent performance control

  • Adaptive learning optimizes the open and closed vent line positions
  • Overall tank pressures are lower in dynamic situations and at high-fuel levels

OBDII Leak Detection 

  • Enables segregate fuel tank and vent lines to help pinpoint leak
  • Allows for the use of more accurate fuel level sensing
  • Provides means to pressurize fuel tank for OBDII leak checks

Vapor Vent Control

Tank / canister isolation

  • Controlled venting assists highly boosted engines, as the natural vacuum used to purge the charcoal canister, present in a traditional internal combustion engine, may no longer be available

Pressurized tank management

  • System can replace current FTIV (Fuel Tank Isolation Valve), which is used to plug the fuel tank on hybrid vehicles when the electric motor is operating, thereby reducing cost and complexity
  • eVaptive system has the ability to control the bleed-down pressure needed in hybrid vehicle fuel tanks prior to refueling, for better vapor management

Refueling control

  • Reduces development time with ease of parameter change via software
  • Not impacted by shut-off height of mechanical refueling valves (FLVV)
  • Not affected by frequent refueling, such as occurs with rental cars. With many conventional systems, the float mechanism can’t be closed and reopened again when only a small amount of fuel is used from a full tank of gasoline

Engineering Capabilities

Eaton's world class engineering and design expertise are leading the way in developing innovative and highly efficient fuel emissions controls. Dedication to system optimization has achieved a quality control rating of less than 2 PPM (parts per million).