Dual Fuel Engine
DF or Duel Fuel Engines are the type of engines that can operate on a mixture of diesel fuel and gas fuel or it can work on diesel fuel alone. Duel Fuel engines are not able to work on gas alone since they do not have an ignition system, nor do they possess any 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 Methane slippage as well as fuel efficiency.. For example, the fuel efficiency may be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100 percent load. It can even be lower or higher loads.

Lift Truck Classification and Fuel Sources
There are certain recycling materials handling applications that can prove very challenging for lift trucks. For instance, scrap metal is amongst these issues. In order to successfully handle items like this needs utilizing the right type of machine for the job.

There are 7 major lift truck classes, including power sources like hydrogen fuel cell, liquid propane gas, diesel, electric and gasoline. The power source is linked to some of these specific classes. The main power sources for forklifts consist of 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 V and IV, internal combustion trucks are more popular. The most popular electric power source is the lead-acid battery. Among internal combustion trucks, about more than 90% are fueled by propane.

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