Dual Fuel Engine
The Dual Fuel engine is a type of engine which uses a mixture of diesel fuel and gas fuel or could work off of diesel by its self. The dual fuel engine is not capable of working on gas alone. These engines do not have ignition systems and do not use spark plugs.

Because the engine is not a pure diesel engine and diesel is not a pure gas, this machinery does suffer from poor fuel efficiency and 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 can even be greater on lower loads.

Lift Truck Classification and Fuel Sources
There are certain applications that have proved difficult for the forklift. Like for example, scrap metal is amongst these issues. To be able to successfully handle items like this requires using the right kind of equipment for the job.

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

The most popular 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 common electric power source is the lead-acid battery. Among internal combustion trucks, roughly over 90% are powered by propane.

The most common power source for lift trucks is battery. Battery fueled units make up around 60% of the new forklifts sold within the United States. Their benefits include: quiet operation, less maintenance requirements, the ability to be used outdoors and indoors with no harmful emissions.