Frequently Ask Questions

General information Questions:

Is the Rentar technology patented?
Rentar has 38 domestic and international patents and is protected out to 2031. Rentar vigorously defends its proprietary interest.


What is the baseline data?
Baseline data is the fuel consumption information gathered before a test program begins. It is used later to provide a comparison for assessing program impact against the post install data.

Catalyst Questions:

What is a catalyst?
A metal or rare earth element that affects the rate of a chemical reaction but is not itself consumed in the process, also a substance that increases the rate of a chemical reaction. Catalysis is the modification and especially an increase in the rate of a chemical reaction induced by material unchanged chemically at the end of the reaction.


What does the catalyst used by Rentar do?
It lowers the “activation energy” of the pre-combustion process allowing for a reaction on the fuel that changes the hydrocarbon molecular structure to a homogenous diesel fuel mixture that allows the engine to burn the fuel more completely reducing the harmful greenhouse gas emissions and increasing the fuel efficiency of the engine.


Is the Rentar Fuel Catalyst an additive?
No. Laboratory testing has proved that nothing within the catalyst leaches into the fuel. If it did, then it would be considered an additive. In addition, typical chemical additives are not catalyst. They are consumed with the burning of the fuel which does not happen with a true catalyst.


How does the Rentar Fuel Catalyst reduce smoke?
Smoke is unburned fuel.  The Rentar Fuel Catalyst will condition the fuel to burn more completely thus reducing the smoke.


Can the Rentar Fuel Catalyst be installed vertically instead of horizontally?
It is recommended to always install the Rentar horizontally when possible. However, some installations may require some vertical angle of degree, which is permissible, as long as the fuel moves through the catalyst from top to bottom in older engines.


How does the Rentar Fuel Catalyst protect my engine and prolong engine life?
Depending on the age or hours on the engine, approximately 30% of the exhaust (fuel soot) from the combustion chamber can be trapped in the engine’s crankcase. This contaminates the oil in the engine and is the main cause of oil breakdown. The Rentar Fuel Catalyst improves the combustion process, thus allowing more complete burning of the fuel. Oil analysis tests have proven that by using the Rentar Fuel Catalyst, the fuel soot levels have been substantially reduced; thus keeping the oil cleaner.


Does the Rentar Fuel Catalyst need to be serviced?
No. Once the catalyst is properly installed there is no further maintenance required.


Will installing the Rentar Fuel Catalyst void engine warranty?
No. Caterpillar, Cummins, Detroit Diesel, Volvo, and International have issued Rentar a letter stating that the use of the Rentar does not in and of itself void the manufacturer’s warranty. These engine manufactures along with all the others have a section on their engine warranties covering aftermarket products and how their warranties are affected. Basically, they say that the engine warranty does not cover damage from aftermarket products. Rentar carries product liability to cover such an event should it happen. Our policy has never had a claim made against it.


On what engine does the Rentar Fuel Catalyst work best?
Noteworthy improvements occur both on newer electronically fuel injected engines as well as older mechanically fuel injected engines.


How much diesel smoke and exhaust pollution can a Rentar Fuel Catalyst eliminate?
The Rentar Fuel Catalyst (RFC) has been independently tested extensively and on average reduces NOx by up to 19%, CO by 7%, PM by up to 19% and THC by up tp 11%. Reductions in opacity or black smoke can be even larger and is apparent to the naked eye on older smoking vehicles within a few hours after installation.

Fuel Related Questions:

 How much fuel will I save?
From 2% to 30% documented as per application. Results can vary with application, fuel, and engine or furnace/boiler type.


Aren’t all fuel savers or conditioners alike?
No. Other devices or fuel (chemical) additive products may have some benefits but the Rentar Fuel Catalyst produces significant well-documented results without the potential disadvantages that can come from the use of other products. For example, fuel additives have ongoing costs which never end, while the Rentar catalyst has a onetime cost factor. The ROI for the Rentar catalyst is most always under a year. After that, the benefits of fuel and emission reductions continue indefinitely at no additional cost.


If we bypass the fuel filter, will the Rentar filter the fuel?
The Rentar will not act as a filter, thus fuel will not be filtered when it is passed through the RFC.

Model and Selection Criteria:

What are the models available in Rentar?
There are seventeen Rentar Fuel Catalyst models.  The FN series is for furnace/boilers and the EN series is for combustion engines.


What is the main selection criteria for RFC units?
The internal diameter of the fuel line which carries fuel to the point of combustion is the most important criteria for selecting the suitable RFC unit. Type of equipment, type of fuel, fuel pressure, flow rate, and fuel temperatures also have to be considered.


How big is the RFC?
The specific size employed depends on the horsepower and configuration of the engine. Different sizes for different engine models. 10” – 20” long and ranging in diameter from 1 1/4” to 3”; weights vary by size; the standard is around 3 pounds.


How does RFC work?
Fuel molecules have a tendency to cluster together. At the point of combustion, the outer molecules protect the inner molecules from being covered with oxygen resulting in some of the inner molecules going unburned and blowing out the exhaust as emissions. When fuel is passed through the Rentar Fuel Catalyst’s combination of metallic and rare earth elements, just prior to combustion, a reaction occurs which separates the clustered molecules so more of the fuel molecules surface area is exposed to oxygen at the time of combustion. The re-proportioning of the straight chain aliphatic paraffin to unsaturated ring compound aromatics releases a small amount of hydrogen that reacts with the oxygenated molecules to enhance the burn. It also causes the combustion temperature to be lower which results in a lower NOx formation.


How soon will we see results?
The Rentar Fuel Catalyst will start working as soon as it is installed, but will not show maximum benefits until the engine has operated for approximately 250 hours or 10,000 miles (16000 km) under load. This is because the fuel system needs to have the Rentar’s catalyzed treated fuel running through the engines injectors for some time to clean out varnishes, gum deposits and built-up carbon in the cylinders that have accumulated over time from untreated fuel.

Usage and Installation Information:

What type of fuel can the Rentar Fuel Catalyst be used with?
In the U.S. there are several different types of fuel. The catalyst will work with all fossil fuels including diesel #1, diesel #2, diesel #4, diesel #6 also referred to as bunker “C”, JP 8, JP 5 and gasoline fuels. Similar matching fuel designations exist in the various countries the catalyst is sold in and all can be used with the Rentar Fuel Catalyst as well. In addition, Diesel #6 or bunker “C” or heavy fuel oils as it is called in other countries have to be heated to allow the fuel to flow.  We have catalysts that can handle high heat and high-pressure applications.


How long does it take to install a RFC?
The installation takes about 20 minutes.


Can we install RFC after the primary pump?
Yes, but not after a high-pressure fuel pump, which in most cases is not the primary pump, as the fuel pressure is much higher, hence do not install RFC units after high-pressure fuel pumps.


What is the maximum pressure allowed inside Rentar?
350 PSI – 23 bars.


What is the maximum fuel temperature allowed inside the catalyst?
270*F – 132*C.  Special models are available for higher temperature tolerances.

Emission Related Questions:

What is Particulate Matter?
Particulate Matter is tiny subdivisions of solid matter suspended in a gas or liquid. Sources of particulate matter can be manmade or natural. Air pollution and water pollution can take the form of solid particulate matter, or can be dissolved. Salt is an example of a dissolved contaminant in water, while sand is generally a solid particulate.


What causes black smoke and exhaust pollution?
Unburned fuel being blown out of the exhaust is the primary cause.


How much smoke and exhaust pollution will we reduce?
Between 5% and 58.2%

Catalyst Component Questions:

Are the rare earth materials present in the Rentar toxic in nature?
No, an EPA and CARB laboratory has confirmed they are not toxic in nature.


How many rare earth materials are there?
There are seventeen rare earth elements in the world. Rentar has picked some of these to use in the Rentar fuel catalyst.


Will the rare earth materials dissolve into the fuel?
The rare earth materials present inside the Rentar act as a catalyst with laboratory confirmation that they do not dissolve or leach into the fuel.


Are there any magnets inside the Rentar?
No, there are no magnets present inside the Rentar.