Dual Fuel Engine
The Dual Fuel engine is a kind of engine that uses a mixture of gas fuel or diesel fuel or can work 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.

As the engine is not a pure diesel engine and diesel is not a pure gas, this machinery does suffer from Methane slippage and fuel efficiency. For example, the fuel efficiency may be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100% 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 amongst these problems. To be able to successfully handle items like this needs using the correct type of machine for the job.

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

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 popular electric power source is the lead-acid battery. Amongst internal combustion trucks, approximately over 90 percent are propane powered.

The most common power source for lift trucks is battery. Battery powered units make up approximately 60% of the new forklifts sold within the USA. Their benefits comprise: quiet operation, less maintenance requirements, the ability to be used indoors and outside with no harmful emissions.