Dual Fuel Engine
DF or Duel Fuel Engines are the type of engines which could run on a mixture of diesel fuel and gas fuel or it can operate on diesel fuel alone. Duel Fuel engines can not operate on gas alone since they do not have an ignition system, nor do they have any spark plugs.

Since the engine is not a pure diesel engine and diesel is not a pure gas, this equipment does suffer from Methane slippage and fuel efficiency. For instance, the fuel efficiency can be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100 percent load. It could even be greater on lower loads.

Lift Truck Fuel Sources and Classifications
There are certain applications that have proved a challenge for the forklift. Like for example, scrap metal is one of these issues. To be able to successfully handle things like this needs using the right type of machine for the task.

There are 7 major lift truck classes, including power sources such as liquid propane gas, hydrogen fuel cell, electric, gasoline and diesel. The power source is linked to some of these specific classes. The main power sources for forklifts include Battery, Diesel, Gasoline, Fuel Cell and Propane.

The most popular overall are electric powered trucks, mainly in Class III, II and class I forklifts. In Classes V and IV, internal combustion trucks are more popular. The most common electric power source is the lead-acid battery. Out of internal combustion trucks, around more than 90 percent are propane powered.

The most common power source for lift trucks is battery. Battery fueled models make up roughly 60% of the new forklifts sold within the United States. Their benefits comprise: quiet operation, less maintenance requirements, the ability to be utilized outside and inside with no harmful emissions.