Dual Fuel Engine
DF or Duel Fuel Engines are the type of engines which can run on a mixture of gas fuel or diesel fuel or it can run on diesel fuel alone. Duel Fuel engines can not run 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 fuel efficiency, as well as Methane slippage.. For instance, the fuel efficiency can be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100% load. It could even be greater on lower loads.

Lift Truck Fuel Sources and Classifications
There are certain applications that have proved a challenge for the forklift. Like for example, scrap metal is one of these problems. To be able to successfully handle things like this needs 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 liquid propane gas, hydrogen fuel cell, diesel, electric and gasoline. The power source is linked to several of these specific classes. The main power sources for forklifts comprise Battery, Diesel, Gasoline, Propane and Fuel Cell.

Electric powered trucks are the most common, mostly Class III, III and class I 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, around more than 90 percent are powered by propane.

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