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

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

Lift Truck Classification and Fuel Sources
There are certain recycling materials handling applications that could prove very difficult for lift trucks. Like for example, scrap metal is amongst these problems. In order to successfully handle things like this requires utilizing the correct type of machinery for the task.

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

The most common 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 common electric power source is the lead-acid battery. Amongst internal combustion trucks, around over 90 percent are propane powered.

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