EVS has been a leader in alternative fuel system design and conversion since 2006. As the winner of the prestigious GM Alt Fuels Van Program in 2010, we continue to offer excellent product design, conversion, warranty & tech support and customer service today. In addition, we have also invested in our own low pressure system design and have been manufacturer of record for all of our authorized kits, since 2018.

*We match all OEM warranties and can sell kits to authorized installers or handle complete conversions with our one-stop-shop model and many ship-through codes.


Natural gas is an odorless, nontoxic, gaseous mixture of hydrocarbons—predominantly methane (CH4). It accounts for about a quarter of the energy used in the United States.

In recent years, 80% to 90% of the natural gas used in the United States was domestically produced. Most natural gas is drawn from wells or extracted in conjunction with crude oil production.

Two forms of natural gas are used in vehicles: CNG and LNG. Both are clean burning, domestically produced, relatively low priced, and widely available. Because of the gaseous nature of this fuel, when stored onboard a vehicle, it must be in either a compressed gaseous (CNG) or liquefied (LNG) state.


EVS Electric Drive Systems Icon

Hybrid Electric Drive Systems drive just like the others in a fleet – no driver training required. Because the system installs under the vehicle body, there’s no impact on cargo space. Hybrid Electric Drive System systems generates 100% of its own electricity during deceleration, eliminating the need for costly fueling infrastructure.

Using electricity to power vehicles can have significant energy security and emissions benefits.


EVS Hydraulic Braking System Icon

Hydraulic Hybrid Regenerative Braking Drive Systems can be added to the driveline of a vehicle to regenerate braking energy. Hydraulic pumps and a lightweight accumulator store braking energy and upon acceleration use the stored energy to provide torque to power the wheels. The fuel efficiency gains are achieved by regenerating the braking energy that is normally wasted to heat, and using this energy instead of the internal combustion engine for acceleration.


EVS Hydrogen Fuel Cell Icon

Hydrogen, when used in a fuel cell to provide electricity, is an emissions-free alternative fuel produced from diverse energy sources. Currently, drivers of fuel cell electric vehicles (FCEVs) can fuel up at retail stations in less than 5 minutes and obtain a driving range of more than 300 miles. Research and commercial efforts are under way to expand the limited hydrogen fueling infrastructure and increase the production of FCEVs.




Also known as liquefied petroleum gas (LPG) or autogas, propane is a clean-burning, high-energy alternative fuel that’s been used for decades to power light, medium and heavy-duty propane vehicles.


Propane has a high octane rating and excellent properties for spark-ignited internal combustion engines. It is non-toxic and presents no threat to soil, surface water, or groundwater.


Propane is produced as a by-product of natural gas processing and crude oil refining. It accounts for about 2% of the energy used in the United States.




ECO Vehicle Systems ship-thru codes:

  • General Motors: Trucks and Vans

  • Ford drop-ship for Trucks and Vans




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EVS 2019 Vehicle Certs List



Law enforcement agencies across the nation are taking control of their fleet fuel expenses by adopting alternative fuel solutions. In an effort to save departments money and to help promote green and sustainable communities, Eco Vehicle Systems, the nations most experienced conversion experts offer LEO/first responder rated vehicles for Fords, Dodge and GM vehicles.

EVS' bi-fuel, alternative fuel systems have been designed and purpose built for law enforcement vehicles. These advanced, next generation systems have been rigorously tested by sheriff and police departments throughout the U.S. to ensure unparalleled safety and performance under extreme use conditions. They are EPA certified, NFPA 52/58 Compliant and DOT approved. This system also offers Eco’s Pursuit Optimization Protocol (POP) which is a zero power loss program that kicks in during periods of high performance demand ensuring optimal vehicle performance!

Finding what you're looking for? If not, please contact us to learn more.


The Eco Vehicle Systems school bus repower solution is a drop-in replacement propane powertrain to replace the International VT365 or DT-466 diesel engine.  This is not a conversion system; it is a completely new powertrain replacement using a dedicated propane engine designed and purpose built for propane.

ADVANTAGE: High Performance + Low Cost of Ownership

The new 8.0 Liter V8 has the hardened components, high compression, and specifically designed engine management system to take advantage of the high octane rating of propane.  The result is a smoother running, higher- performing, extremely low emissions engine that saves on every gallon consumed and doesn’t have costly EGR, D.E.F., and particulate filter issues.

ADVANTAGE: Clean Air for Students

As careful as school districts have become to protect children from harmful diesel emissions with no-idle zones and other precautions, diesels still produce emissions when starting or running in front of the school where the children and employees walk.  Our propane buses don’t stink, and have virtually zero particulate pollutants. Source =


The re-power process involves removal of the old powertrain from the fan and all the engine accessories to
the drive shaft.

  • The transmission is then completely rebuilt and re-geared to match the power curve of the propane V8 and a new Allison Transmission approved calibration is loaded into the transmission control computer.

  • The new engine and accessories are mated to the transmission and are installed with new mounts.

  • New exhaust and EPA certified catalytic converters replace the old diesel components.

  • A new one-piece integration wiring harness is installed to seamlessly adapt the new powertrain to the
    chassis. Integration of the new engine, transmission, chassis, and instrument cluster is plug-and-play.

  • The diesel fuel tank is removed and replaced with a 60-gallon propane tank.

ADVANTAGE: Ease of Maintenance

Maintenance and repair become as simple as that of a gasoline engine; in fact, the engine is based on the tried-and-true General Motors Big Block V8, making maintenance and repair such as spark plugs effectively child’s play to the experienced technician.




The VW fund is called Environmental Mitigation Trust (EMT) and is part of the $14.7 billion dollar settlement in 2016. The settlement was a result of actions by VW circumventing emissions testing protocol and thus being accused of cheating emissions standards. These EMT funds are specifically dedicated to reducing diesel emissions. Because the circumvention measures (emissions cheating) focused on NOx emissions produced when the engine burned diesel fuel, the first criteria states programs are required to address is NOx emissions. Other US EPA criteria pollutants aka greenhouse gases or GHG are secondary.

Download the VW Grant Primer to learn more...