MORGANTOWN, W.Va. (AP) — Researchers at West Virginia University are teaming up with the Environmental Defense Fund to study methane emissions from natural gas fueling stations.

Government agencies and the private sector are increasingly looking at natural gas-powered vehicles to save money.

Scientists say they could produce fewer greenhouse gas emissions than diesel vehicles, but only if methane leaks are contained.

WVU's Center for Alternative Fuels, Engines and Emissions says those leaks occur at various stages in vehicle refueling, and it's important to provide insight to a growing industry.

Researchers will look at both compressed and liquefied natural gas refueling sites and maintenance facilities.

Their results will likely be released later this year or in early 2014.

Principal investigator Nigel Clark says vehicles to be tested include buses, tractor-trailers and private industry fleets.