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

Since 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. Like for instance, 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 Classification and Fuel Sources
There are certain recycling materials handling applications which can prove really challenging for lift trucks. Like for example, scrap metal is one of these issues. In order to successfully handle items like this requires using the right kind of machine for the job.

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

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

The battery is the forklifts most popular power source. Battery fueled units make up about 60% of the new forklifts sold in the USA. Their benefits comprise: less maintenance requirements, quiet operation, the ability to be used indoors and outdoors with no harmful emissions.