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

As the engine is not a pure diesel engine and diesel is not a pure gas, this equipment does suffer from poor fuel efficiency and Methane slippage. Like 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 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. For example, scrap metal is among these issues. To be able to successfully handle items like this requires using the correct kind of machinery for the task.

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

The most popular overall are electric powered trucks, mostly 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. Among internal combustion trucks, approximately over 90 percent are propane powered.

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