Dual Fuel Engine
DF or Duel Fuel Engines are the type of engines that could operate on a mixture of gas fuel or diesel fuel or it could operate on diesel fuel alone. Duel Fuel engines can not run on gas alone as they do not posses 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. 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 greater on lower loads.

Lift Truck Fuel Sources and Classifications
There are certain applications which have proved a challenge for the forklift. For instance, scrap metal is among these problems. In order to successfully handle items like this requires using the correct type of machine for the job.

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

The most common overall are electric powered trucks, mostly 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. Amongst internal combustion trucks, about more than 90 percent are powered by propane.

The most popular power source for lift trucks is battery. Battery fueled units make up about 60 percent of the new forklifts sold in the USA. Their benefits include: less maintenance requirements, quiet operation, the ability to be utilized outside and indoors with no harmful emissions.