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

Because 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 may 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 Classification and Fuel Sources
There are certain applications which have proved difficult for the forklift. For instance, scrap metal is one of these problems. In order to successfully handle things like this needs using the correct kind of equipment for the job.

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

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

The battery is the forklifts most popular power source. Battery fueled units make up roughly 60 percent of the new forklifts sold within the USA. Their benefits comprise: quiet operation, less maintenance requirements, the ability to be used outside and inside with no harmful emissions.