Dual Fuel Engine
DF or Duel Fuel Engines are the kind of engines that could run on a mixture of diesel fuel and gas fuel or it can work on diesel fuel alone. Duel Fuel engines are not able to operate on gas alone because they do not have an ignition system, nor do they possess any spark plugs.

Because the engine is not a pure diesel engine and diesel is not a pure gas, this machine does suffer from poor fuel efficiency and Methane slippage. For instance, the fuel efficiency can be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100% load. It can even be greater on lower loads.

Lift Truck Classification and Fuel Sources
There are some recycling materials handling applications which could prove very challenging for lift trucks. Like for example, scrap metal is one of these problems. To be able to successfully handle things like this requires utilizing the correct type of equipment for the task.

In this write-up, the 7 major lift truck classes are discussed, including the power sources like 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 include Battery, Diesel, Gasoline, Fuel Cell and Propane.

Electric powered trucks are the most common, mainly Class I, II and class III forklifts. Internal combustion engines are more common in Classes IV and V. The most common electric power source is the lead-acid battery. Among internal combustion trucks, roughly over 90% are propane powered.

The battery is the forklifts most popular power source. Battery fueled units make up roughly 60 percent of the new forklifts sold in the USA. Their benefits comprise: quiet operation, less maintenance requirements, the ability to be utilized outside and inside with no harmful emissions.