Dual Fuel Engine
The Dual Fuel engine is a type of engine which utilizes a mixture of diesel fuel and gas fuel or could operate 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 utilize 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.. Like for instance, the fuel efficiency may be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100% load. It can even be lower or higher loads.

Lift Truck Fuel Sources and Classifications
There are some applications that have proved difficult for the forklift. For example, scrap metal is one of these issues. In order to successfully handle items like this needs using the right kind of machinery for the task.

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 some of these specific classes. The main power sources for forklifts comprise Diesel, Gasoline, Battery, Propane and Fuel Cell.

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

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: quiet operation, less maintenance requirements, the ability to be used inside and outdoors with no harmful emissions.