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

As the engine is not a pure diesel engine and diesel is not a pure gas, this machine 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 certain recycling materials handling applications which can prove very difficult for lift trucks. For instance, scrap metal is amongst these issues. In order to successfully handle items like this needs using the right type of machinery for the task.

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

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

The battery is the forklifts most common power source. Battery powered units make up about 60 percent of the new forklifts sold in the USA. Their benefits include: quiet operation, less maintenance requirements, the ability to be utilized indoors and outside with no harmful emissions.