Dual Fuel Engine
DF or Duel Fuel Engines are the kind of engines that could 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 operate on gas alone because 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 example, the fuel efficiency can 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 some applications which have proved difficult for the forklift. For example, scrap metal is one of these problems. In order to successfully handle things like this needs using the right type of machine for the task.

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

Electric powered trucks are the most common, mostly Class I, II and class III forklifts. Internal combustion engines are more popular in Classes IV and V. The most common electric power source is the lead-acid battery. Amongst internal combustion trucks, roughly over 90% are propane powered.

The most common power source for lift trucks is battery. Battery fueled models make up around 60% of the new forklifts sold in the United States. Their benefits include: quiet operation, less maintenance requirements, the ability to be utilized indoors and outside with no harmful emissions.