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

Since the engine is not a pure diesel engine and diesel is not a pure gas, this equipment does suffer from Methane slippage and fuel efficiency. Like 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 lower or higher loads.

Lift Truck Fuel Sources and Classifications
There are some recycling materials handling applications which could prove very difficult for lift trucks. For example, scrap metal is amongst these problems. In order to successfully handle things like this requires utilizing the correct type of machine for the job.

There are 7 major lift truck classes, including 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 consist of Diesel, Gasoline, Battery, Propane and Fuel Cell.

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

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