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Technical Papers

Leo Thomason is the Executive Director of Natural Gas Vehicle Institute (NGVi), a division of AFVi, where he applies his more than 25 years of alternative fuels experience to developing and serving as the lead instructor for a variety of natural gas related training courses for fleets around the world.  Leo developed and is the lead instructor for NGVi’s natural gas vehicle fuel system and fuel storage cylinder inspection training course. In this Technical Paper, Leo answers the most commonly asked questions about compressed natural gas (CNG) fuel system inspections.
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Clause and Effect: What to Look For In an Effective Natural Gas Transportation Fuel Contract Thumbnail

Clause and Effect: What to Look For In an Effective Natural Gas Transportation Fuel Contract
Choosing a third-party operator to provide natural gas fueling can be an excellent option for fleets who don’t want the responsibility of owning or maintaining fueling equipment.  However, fleets who choose this option need to understand how natural gas fueling works and must articulate your needs clearly to avoid the need for costly remediation.  This, of course, requires an impartial expert who understands the subtleties of what is involved in the contractual relationship between a fuel provider and a fleet operator.  Omissions or vague and uncertain provisions are usually settled in favor of the party drafting an agreement.  Usually that party is the one that controls the money.  Natural Gas Vehicle Institute (NGVi), a division of AFVi, highlights these contract suggestions, learned from our experience in working directly with fleets, which will save you money and headaches down the road. 
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The Symptoms, Diagnosis and Prevention of Oil Carryover

The Achilles Heel of Natural Gas Vehicles: The Symptoms, Diagnosis and Prevention of Oil Carryover

A large transit agency was experiencing engine performance problems with their natural gas buses. Their contracted service technician, responsible for maintenance of the fueling station, diagnosed the problem as an engine issue. NGVi, a division of AFVi, was brought in after explaining to agency management that the sealed fuel system onboard the vehicle allows gas to flow only one way, making it improbable that the oil could leak from the engine into the onboard fuel system.

The technician in question, like many working on natural gas vehicles, assumed a vehicle problem even though the majority of engine performance issues are attributable to oil carryover, which is a problem that begins at the fueling station. If the vehicle is hard to start, hesitates under acceleration, runs rough or stalls frequently, chances are the problem is with oil from the natural gas fueling station compressor carrying over into the vehicle fuel system.

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Publications

NGVs: The Decision Starts Here Thumbnail

Natural Gas Vehicles: The Decision Starts Here
From light- to medium- to heavy-duty options, natural gas vehicles are becoming an increasingly popular addition to fleets’ alternative fuel vehicle fleet mix. This publication is designed to help fleet managers learn more about the use of natural gas as a transportation fuel and natural gas vehicles (NGVs). It provides an overview of natural gas as an energy source and a review of NGV and fueling technologies.
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Conference Presentations

AF&V 2009 Conference Presentations DVD

Alternative Fuels & Vehicles National Conference +
Expo 2010 Presentations on DVD
Revisit the cutting-edge information presented by industry and government experts at AF&V 2010 from the convenience of your computer. This DVD features video f the general sessions, plus more than 100 AF&V 2010 presentations, covering topics related to fuels, vehicles, technologies, funding, policy and market trends. Order yours today!
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AF&V 2009 Conference Presentations DVD

Alternative Fuels & Vehicles National Conference +
Expo 2009 Presentations on DVD

Revisit the cutting-edge information presented by government and industry experts at the annual Alternative Fuels & Vehicles Conference + Expo 2009 held in Orlando, FL, April 19-22 from the comfort of your computer. For the first-time ever, AFVi is offering the compilation of conference presentations all on one convenient DVD.
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