Dual Fuel Engine
DF or Duel Fuel Engines are the kind of engines that could run on a mixture of gas fuel or diesel fuel or it can run on diesel fuel alone. Duel Fuel engines can not operate on gas alone since they do not posses an ignition system, nor do they have 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 fuel efficiency, as well as 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 lower or higher loads.

Lift Truck Fuel Sources and Classifications
There are certain recycling materials handling applications which could prove very difficult for lift trucks. For instance, scrap metal is one of these issues. In order to successfully handle items like this requires using the right type of machine for the task.

In this write-up, the 7 major lift truck classes are discussed, including the power sources such as liquid propane gas, hydrogen fuel cell, diesel, electric and gasoline. The power source is linked to some of these particular classes. The main power sources for forklifts include Diesel, Gasoline, Battery, Propane and Fuel Cell.

Electric powered trucks are the most common, mostly Class III, III and class I forklifts. Internal combustion engines are more common in Classes IV and V. The most common electric power source is the lead-acid battery. Amongst internal combustion trucks, about over 90 percent are fueled by propane.

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