Dual Fuel Engine
DF or Duel Fuel Engines are the kind of engines which can work on a mixture of gas fuel or diesel fuel or it could run on diesel fuel alone. Duel Fuel engines could not operate on gas alone as they do not have an ignition system, nor do they possess 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 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 recycling materials handling applications which could prove really challenging for lift trucks. Like for example, scrap metal is amongst these problems. In order to successfully handle things like this requires using the correct kind of machinery for the task.

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 particular classes. The main power sources for forklifts comprise Diesel, Gasoline, Battery, Fuel Cell and Propane.

The most common overall are electric powered trucks, mostly in Class I, II and class III forklifts. In Classes IV and V, internal combustion trucks are more common. The most popular electric power source is the lead-acid battery. Out of internal combustion trucks, approximately over 90 percent are fueled by propane.

The battery is the forklifts most common power source. Battery fueled models make up approximately 60 percent of the new forklifts sold in the USA. Their benefits consist of: less maintenance requirements, quiet operation, the ability to be used inside and outside with no harmful emissions.