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

Because 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 example, the fuel efficiency can be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100 percent load. It can even be lower or higher loads.

Lift Truck Classification and Fuel Sources
There are certain applications that have proved difficult for the forklift. For instance, scrap metal is among these problems. In order to successfully handle items like this requires utilizing the correct type of machinery for the task.

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

Electric powered trucks are the most popular, mainly Class III, III and class I forklifts. Internal combustion engines are more popular in Classes V and IV. The most popular electric power source is the lead-acid battery. Amongst internal combustion trucks, around more than 90 percent are fueled by propane.

The battery is the forklifts most popular power source. Battery fueled units make up approximately 60 percent of the new forklifts sold within the United States. Their benefits consist of: quiet operation, less maintenance requirements, the ability to be used inside and outdoors with no harmful emissions.