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US Energy Provides Dual-Fuel Diesel-to-CNG Conversion Systems to GM Thailand

US Energy’s HFS uses diesel as a pilot and then replaces as much as 80% in dual-fuel operation. Click to enlarge.

Tampa, Florida-based US Energy Initiatives Corporation announced final delivery in Thailand of its dual-fuel conversion system for use in the General Motors Thailand (GMTH) Colorado Pickup. US Energy is an ISO-9001 certified manufacturer of a patented dual-fuel diesel-to-natural gas conversion technology: the Hybrid Fuel System (HFS).

For 2007 models, GMTH intends to offer Thai consumers a dual-fuel, natural gas/diesel option for their Chevy Colorado pickups. The program is scheduled for launch during the Thailand Motor Expo in December, following an introductory presentation at the Asia Automotive trade fair held November 9-12 in Bangkok, Thailand, and at the APEC CEO Summit in Vietnam.

According to US Energy’s Weekly Fuel Price Report for the week ending August 19th, the Thai consumer currently pays an estimated 104.104 Thai Baht ($2.79 US) per gallon of diesel while a dual fuel gallon consisting of approximately 65% natural gas/35% diesel, would cost an estimated 57.39 Thai Baht ($1.53 US).

GM has been working closely with the Thai government on a number of alternative fuel initiatives, including CNG conversion technology, so we’re proud to be leading the Thai market in equipping our vehicles with CNG conversion capabilities. With the sustained high prices of fuel, this option will make our one-ton Chevrolet Colorado pickup even more popular with Thai consumers, by offering a certified safe and economical fuel conversion system.

—William Botwick, President of GM’s Southeast Asia Operations and President of General Motors Thailand

HFS systems start the engine with diesel fuel and then inject an increasing amount of natural gas—up to 80%—cutting back on the diesel as the engine speed and load increases. Engine modifications are not required, and the company claims that vehicles retain the diesel engine qualities of performance, torque, power, and efficiency. When operating with natural gas, the system reduces NOx emissions by at least 30% and PM emissions by 80–90%.

The system consists of a set of parts that can be installed on most medium- and heavy-duty diesel engines within a day by a trained technician. Components include:

  • The ECU programmed to meter a precise mixture of natural gas and diesel in response to engine speed, load, temperature and other operating conditions;

  • A gas regulation system that maintains a smooth fuel supply under all conditions;

  • A gas injection system that allows precise metering under rapidly changing engine conditions; and

  • Sensors, wiring harnesses, and all other parts.




And why is Fuel cheeper in Thailand and not in the US. The process to crack, Make fuel, has less processes than gas to make and why is Fuel more.

When will this hit the US and convert GM, Ford and Dodgle trucks to utilize this technology?

Sid Hoffman

Labor and land costs are lower, plus they typically have far fewer environmental regulations to comply with, which further reduces costs.

Charles S

$2.79 for gasoline may be "cheap" for US, but when average Thai make fractions of what US counterpart makes, then it is by no means "cheap" for the locals.


Where's the news? Westport & Cummins has been doing this for years.

Mark A

I think an aftermarket company, BullyDog(?), has kits for propane injection for full size diesel trucks currently, which is similar. But nowhere near the 80% that this system reports. Maybe has a need in markets with excess natural gas. Otherwise, not much to use here.

Roger Pham

This is smart, very smart! And, it would be smarter still, when that diesel fuel is replaced by hydrogen/natural gas mixture (NaturalHy, everyone? ;). Of course, the ultimate in smartness is when that hydrogen and natural gas are made from renewable energy, and the pickup truck is an ICE-electric hybrid for maximum energy efficiency. Oh well, I'll settle for the combination of bio-diesel and renewable natural gas (from waste biomass pyrolysis or gasification) running on a hybrid ICE-electric pickup. (GM et al's Dual-Mode Hybrid, eh?)

Well, Dursun, is this NEWS enough for you?

Max Reid

With more LNG terminals under construction, more CNG vehicles will appear in US roads in the future.

Time for automakers to prepare for it now itself.

Fahim Gohar

I wish, I could get such a solution here in Pakistan. I will be the first one to install such a hybrid system in my 2.0 D Corolla Car.


dear sir
we have a setup of convergion diesel in to gas and need kits for diesel in to gas for cars and buses 4 to 6 cylinders
with thanks

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