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

Since 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.. For example, the fuel efficiency can be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100 percent load. It could even be lower or higher loads.

Lift Truck Classification and Fuel Sources
There are some applications that have proved difficult for the forklift. For example, scrap metal is one of these issues. To be able to successfully handle things like this needs using the correct type of machinery for the job.

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

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

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