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

Because the engine is not a pure diesel engine and diesel is not a pure gas, this equipment does suffer from Methane slippage and fuel efficiency. For example, the fuel efficiency could be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100% load. It could even be lower or higher loads.

Lift Truck Classification and Fuel Sources
There are some applications which have proved difficult for the forklift. Like for example, scrap metal is amongst these issues. To be able to successfully handle things like this requires utilizing the right kind of machinery for the job.

There are 7 major lift truck classes, including 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 Battery, Diesel, Gasoline, Fuel Cell and Propane.

Electric powered trucks are the most popular, mostly Class III, III and class I forklifts. Internal combustion engines are more popular in Classes V and IV. 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 common power source. Battery powered models make up around 60% of the new forklifts sold in the United States. Their benefits comprise: less maintenance requirements, quiet operation, the ability to be used outdoors and indoors with no harmful emissions.