Dual Fuel Engine
Dual Fuel or DF Engines are the type of engines which could run on a mixture of diesel fuel and gas fuel or it could work on diesel fuel alone. Duel Fuel engines are not able to work on gas alone as they do not posses 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 machinery does suffer from Methane slippage and fuel efficiency. For instance, the fuel efficiency can be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100 percent load. It could even be lower or higher loads.

Lift Truck Classification and Fuel Sources
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 items like this needs utilizing the right type of machinery for the task.

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

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

The battery is the forklifts most common power source. Battery powered models make up roughly 60% of the new forklifts sold within the United States. Their benefits include: quiet operation, less maintenance requirements, the ability to be used indoors and outdoors with no harmful emissions.