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

Since diesel is not a pure gas, and it is not a pure diesel designed engine, it has some disadvantages in the department of Methane slippage as well as fuel efficiency.. Like for instance, the fuel efficiency could be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100 percent load. It can even be greater on lower loads.

Lift Truck Fuel Sources and Classifications
There are certain applications which 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 utilizing the correct type of machine for the task.

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

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

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