Switching from diesel or petrol to gas is one of the simplest and most cost-effective ways to immediately reduce your impact on local air quality. CNG is a compressed methane (CH4), the simplest hydrocarbon, which burns very homogeneously due to its structure. LPG is a mixture of hydrocarbons—propane (C3H8) and butane (C4H10); while its structure is slightly more complex than CNG, it remains far simpler than petrol (5 to 12 carbon atoms) or diesel (10 to 22 carbon atoms).
The fewer carbon atoms in a chain, the easier it is to achieve complete combustion. Conversely, longer chains increase the likelihood of the chain breaking during combustion, resulting in the formation of soot (pure carbon) or toxic, unburned hydrocarbons (HC) in the exhaust. Hydrocarbons in exhaust gases represent wasted, unconsumed fuel. Due to its simpler molecular structure and a more favorable hydrogen-to-carbon ratio, gas burns more completely and cleanly, generating fewer byproducts.
While petrol has a slightly better molecular profile than diesel, its chains are still significantly longer than those of gas. The reduction of HC emissions stems from the physical properties of gas and the way it mixes with air inside the engine. As a volatile fuel consisting of light molecules, gas enters the combustion chamber as a perfectly homogenized mixture and does not adhere to the internal surfaces of the engine. Combined with substantial fuel cost savings, these factors make gas a globally recognized alternative fuel that continues to grow in popularity every year.
Key ecological benefits of gaseous fuels compared to petrol and diesel:
1. Reduction of Soot and Smog (Particulate Matter – PM): By achieving near-complete combustion, gas eliminates the emission of particulate matter (soot) and toxic hydrocarbons, leading to lower levels of PM2.5 and PM10.
2. Lower Carbon Footprint (CO2): Because gas molecules contain fewer carbon atoms, the oxidation process (converting hydrocarbon into CO2 and H2O) releases less CO2 than petrol or diesel.
3. Lower Nitrogen Oxide (NOx) Emissions: Nitrogen oxides are highly detrimental to the respiratory system. Gas-powered vehicles emit significantly less NOx than diesel engines and noticeably less than older petrol engines.
4. Absence of Sulfur and Lead Compounds: Gas is a chemically pure fuel. It contains no sulfur—which contributes to acid rain—nor any heavy metals.
Detailed information can be found to the right.

The degree of emission reduction is a relative value. It depends on the type of gas used and the fuel it is being compared to. Generally, it is established that a properly calibrated gas system significantly reduces atmospheric emissions.
Below are the detailed data points:
1. Carbon Dioxide (CO2)
While not toxic to humans in low concentrations, its excess in the atmosphere contributes to climate change. Compared to petrol, CO2 emission reductions are 10–15% for LPG and 20–25% for CNG. In comparison to diesel, CO2 emissions remain at a similar level (while diesel is highly efficient, gas is still chemically cleaner).
2. Nitrogen Oxides (NOx)
These are highly toxic gases formed at high temperatures inside the engine. They irritate the respiratory tract and contribute to smog; furthermore, when they react with moisture in the air, they form acids that damage vegetation and infrastructure. Both LPG and CNG reduce NOx emissions relative to petrol and diesel. CNG reduces NOx by 60–80% compared to petrol and up to 90% compared to diesel, while LPG offers a 20–40% reduction over petrol and 80–90% over diesel.
3. Particulate Matter (PM) and Soot
These are microscopic particles of unburned carbon and toxins so small they can pass from the lungs directly into the bloodstream. They are a primary cause of lung and heart diseases, as well as cancer in large urban areas. Gas-powered engines emit 95–99% fewer particulates than diesel engines. For petrol engines, the reduction depends on the engine type: for Direct Injection (GDI/TSI) engines, the reduction is over 98% with CNG and 90–95% with LPG. For indirect injection petrol engines, the reduction is approximately 10–30%, as these engines naturally emit fewer particulates.
4. Hydrocarbons (HC)
These are fuel molecules that have not undergone complete combustion and leave the exhaust system in raw form. In the lower atmosphere, they react with sunlight to create harmful ground-level ozone, which impairs breathing. Gas systems reduce unburned hydrocarbon emissions compared to diesel by approximately 70–80% for CNG and 50–60% for LPG. Compared to petrol, the reduction is 70–90% for CNG and 40–60% for LPG.
It is important to remember that proper system calibration and airtightness are critical. If the system is poorly tuned, combustion temperatures rise, which may cause an increase in nitrogen oxide emissions instead of a reduction.

Gas is an alternative fuel that can significantly reduce urban smog, provided the engine operates within the correct parameters. While it is inherently less harmful and lower-emission than petrol or diesel, its low-emission performance is not automatic; it results from the combination of cleaner fuel, the excellent technical condition of the engine, and a high-quality gas system.
Key requirements for ensuring clean gas combustion in a vehicle:
1. Proper Calibration: Utilize a controller that adjusts the fuel dose in real-time to maintain the ideal air-fuel mixture, ensuring the excess air ratio (lambda) remains at 1. A mixture that is too lean increases nitrogen oxide (NOx) emissions, while a mixture that is too rich increases carbon monoxide (CO) levels.
2. Functional Ignition System: Regularly replace spark plugs and inspect ignition coils to prevent misfires. This ensures that unburned hydrocarbons (HC) are not released into the atmosphere. This is especially critical for CNG, as methane is a potent greenhouse gas.
3. Efficient Catalytic Converter: Running on gas does not eliminate the need for a fully operational exhaust system. The catalytic converter is responsible for the final treatment of exhaust gases, neutralizing residual toxins. Its condition determines whether the vehicle actually meets its emission standards.
4. System leak tightness: Gas—methane in particular—is more harmful to the environment when released directly into the atmosphere than CO2. Therefore, ensuring the gas system is perfectly leak-proof is vital, and this should be verified during periodic technical inspections.

Clean Transport Zones (SCT) are designated urban areas accessible only to vehicles that meet specific emission standards (Euro) or are powered by alternative fuels. In Poland, the installation of an LPG system currently does not change a vehicle’s legal status. However, CNG and LNG drives are legally classified as low-emission and privileged, granting them exemption from entry bans regardless of the vehicle’s age or Euro standard. More significant benefits can be found in countries like Italy, France, and Spain, where a gas system allows vehicles to bypass periodic traffic restrictions for older cars. In Germany, while gas does not grant automatic rights, it significantly facilitates meeting the requirements necessary to obtain a “green sticker”.

The higher the fuel consumption and the longer the engine’s operating time, the faster the ROI (Return on Investment). To accurately calculate the payback period, several parameters are required: the total investment cost, average fuel consumption, distance traveled (or operating hours for a generator), and the price difference between the primary fuel and gas. As a general rule of thumb, a gas system in a passenger car pays for itself after 10,000 – 15,000 kilometers, which typically translates to 6 to 12 months. In the case of heavy-duty trucks or power generators, where fuel consumption and duty cycles are much higher, the investment pays off even faster. We have successfully completed projects where the initial investment was recouped in just a few days.

Due to the inherent characteristics of the diesel engine and the physical properties of the fuel, it is not possible to perform a simple, non-invasive 100% gas conversion as is done with petrol engines. Instead, we offer a Dual-Fuel system, which enables the generator to run on a simultaneous blend of gas and diesel. Our systems are capable of displacing 50–70% of diesel consumption with gas. To calculate savings, we must consider the price difference between the two fuels, the average consumption, and the operating hours.
Example Calculation
Data:
Total diesel consumption per hour (liters): 25L
Operational time: 18 hours per day
Total daily fuel consumption: 450L
Diesel Price: 100% (1,00)
Gas Price: 35% (0.35)
Conversion rate: 60% (60% CNG, 40% Diesel)
Calculation:
Gas portion: 25L*0,6*18H= 270L/day*0,35= 94,5L (equivalent of 94,5L Diesel price)
Remaining Diesel portion: 25L*0,4*18H= 180L/day*1,00=180L
The operating cost of a generator consuming 450L of diesel daily with a Dual-Fuel system is equivalent to the cost of 274.5L of diesel. This results in a total fuel cost of 61% compared to the pre-conversion state, yielding 39% daily fuel savings.
Important Technical Note:
To simplify, this calculation assumes that 1 liter of gas replaces 1 liter of diesel in terms of efficiency. For a detailed analysis, the specific calorific value of the chosen gas must be considered. In reality, CNG has a higher calorific value than diesel, leading to even greater savings, while LPG has a slightly lower calorific value than diesel.
We provide dedicated calculators that incorporate detailed data for a simple, self-service calculation of savings and estimated ROI—contact us to receive them.

Yes, the ZAMEL system can be self-installed provided you have the right equipment and technical knowledge.

What you need for installation:

• ZAMEL software installed on a laptop
• ZAMEL interface cable
• Basic workshop tools: wrenches, screwdriver, soldering iron, screwdrivers, drill bits, pliers, hex keys, insulating tape.

How long does installation take: For someone familiar with the product, a complete system installation typically takes no more than 1 working day.

If you are installing for the first time: We offer remote technical support during installation — we connect to your computer and assist in real time. For those without prior experience, we organise technical training courses with a certificate upon completion. Training can take place at Zamel Grupa’s headquarters or directly at your workshop.

Contact us — we will match the right form of support to your experience level.

The ZAMEL system ensures safety through multi-stage protection that automatically responds to any emergency situation. Automated valves (e.g., the 80% fill-stop lock for LPG or the electromagnetic solenoid valve for CNG) monitor gas pressure and flow, immediately cutting off the gas supply if necessary. The entire installation consists of certified components resistant to high pressure, while electronic parts are additionally protected against voltage surges. All ZAMEL system components are fully homologated, meet European safety standards, and are engineered for long-term, secure operation.

To ensure your gas system serves you reliably for years, please follow these 5 key points:
1. Filter Service: Replacement of both liquid and vapor phase filters should occur every 10,000–15,000 km. A professional system check up  is recommended once a year.
2. Ignition System: Spark plug replacement intervals should be shortened by approximately 30% compared to the manufacturer’s recommendations. The condition of ignition coils and high-voltage leads must be impeccable due to the higher electrical resistance of the gas-air mixture.
3. Petrol System: It is mandatory to maintain a minimum fuel level in the petrol tank to ensure proper cooling of the fuel pump. Additionally, it is advisable to drive short distances on petrol occasionally, as periodic operation on the primary fuel protects the fuel injectors from carbon buildup and seizing.
4. Valve Protection: Regular inspection of valve clearances is required for engines. Furthermore, computer diagnostics of the fuel mixture are essential to prevent cylinder head overheating.
5. Monitor System Settings: Once a year, during the filter replacement, verify the controller’s mapping and check for any diagnostic trouble codes  in the system software.

Yes. It is essential to maintain an adequate level of the primary fuel in the tank alongside the gas supply. In a Bi-Fuel sequential petrol system, although the gas conversion rate is near-total, the engine always ignites using petrol. In a DI (Direct Injection) Bi-Fuel system, the engine consumes up to 10% of the base fuel during operation to protect the injectors. In a Diesel Dual-Fuel system, the engine is powered simultaneously by both fuels—diesel and gas. Furthermore, the gas system activates only after reaching a pre-set temperature (typically no lower than 20–30°C); until this threshold is met, the engine runs exclusively on the primary fuel.

The ZAMEL system is designed for maximum operational flexibility. It allows the user to engage or disengage the gas system at the touch of a button. When the gas supply is depleted, the system automatically switches back to the primary fuel without any interruption in engine performance. The system also features an integrated diagnostic alert: in the event of a malfunction, it emits an audible signal and the switch light flashes before the system automatically shuts down. In such cases, you can safely continue driving on the primary fuel and visit an autogas service center at your convenience.

No, a correctly installed and maintained gas system does not damage the engine. This is one of the most common myths in the industry, originating from the 1990s when gas installations were far less technologically advanced than they are today.

• Where did this myth come from? In older systems, problems like valve seat recession and cylinder head overheating did occur. However, this was primarily due to poor component selection and unprofessional installation — not the gas itself as a fuel.
• How it is today: Modern gas systems are precisely calibrated to a specific engine. Gas burns cleaner than petrol — it leaves no carbon deposits in the combustion chamber and contaminates the engine oil less. With a proper installation and regular servicing, an engine can run for hundreds of thousands of kilometers without issues.
• When can problems occur?
  • System matched to the wrong engine type.
  • Unprofessional installation or lack of proper calibration.
  • Neglected maintenance — infrequent replacement of spark plugs and gas filters.
  • Poor technical condition of the engine before or during gas use.

Gas does not destroy engines — human error does. A correctly selected and installed system in a technically sound vehicle has no negative impact on the engine. That is why we always verify the vehicle’s technical condition and select components based on the specific engine code before installation.

A correctly installed and sealed gas system is completely odorless during driving. If you smell gas, it is a signal that requires immediate action.

Immediate steps to take:

• Turn off the gas system using the switch on the dashboard.
• Switch to petrol or diesel mode.
• Do not smoke and avoid open flames near the vehicle.
• Stop in a well-ventilated area and check if the smell fades.
• Ventilate the vehicle: Remember that LPG is heavier than air (open the doors), while CNG/LNG is lighter (open the windows and sunroof).
• If running on LPG, do not park in a closed garage until the system has been serviced.

Most common causes of gas odor:

• Worn or clogged gas phase filter.
• Leaks at gas line connections.
• Damaged seal or reducer diaphragm.
• Leaking tank valve or multivalve.
• Worn gas injectors.

When to visit a service center: Immediately — do not delay. A gas system leak is a safety issue. Most causes are minor faults that are inexpensive to fix if addressed quickly.

What the service center will check: A certified workshop will perform a leak test of the entire installation — from the tank and hoses to the injectors. At ZAMEL, we offer remote technical support to help diagnose the problem before you even arrive at the workshop.

This varies by country. In Poland, the certification is valid for 10 years for LPG cylinders and 3 years for CNG cylinders. After this period, the tank must undergo re-certification (legalization) or be replaced with a new one to remain legally operational. In Poland, cylinder re-certification is conducted in cooperation with the TDT (Transportation Technical Supervision), and ZAMEL is the only entity authorized to perform this process in the region.

Yes, Polish law does not prohibit this. There is no national ban on gas-powered vehicles entering underground garages; however, the final decision rests with the facility manager. The situation differs for LPG and CNG. LPG is heavier than air. Building regulations state that if a garage is to accommodate LPG vehicles, it must have mechanical ventilation. Older parking lots often rely solely on natural (gravity) ventilation, and parking owners may post a “No LPG” sign to comply with insurance requirements. CNG is lighter than air and dissipates quickly in the event of a leak. Consequently, CNG vehicles are treated differently, and most local restrictions apply only to LPG, allowing CNG vehicles to enter without hindrance.

Damaged injectors can be identified by uneven engine operation, a drop in power, and increased gas consumption. Symptoms tend to worsen gradually. Regular diagnostics performed during filter servicing helps to avoid more costly repairs.

Most common symptoms of damaged injectors:

• Rough engine idling on gas — jerking and vibrations, especially at low RPM.
• Noticeable loss of power when driving on gas.
• Increased gas consumption without any change in driving style.
• Controller errors — warning light or fault codes during diagnostics.
• Difficulty switching from petrol to gas or the system shutting down automatically.

Visit a workshop equipped with an injector flow measurement device. ZAMEL offers high-quality injectors — you can consult our team to select the right model for your specific engine.

LPG is a liquid propane-butane gas. In contrast, CNG and LNG are natural gases stored in two different forms. These fuels differ in their chemical formulas, origin, storage methods, applications, and infrastructure availability.

• LPG (C3H8 & C4H10): A liquefied mixture of propane and butane gases. It is a byproduct of the oil refining process. It is stored in a tank under low pressure in liquid form. The station infrastructure is widely developed in Europe, Africa, and Latin America, and its logistics are relatively simple and efficient.
• CNG (CH4): Compressed Natural Gas. It is a natural raw material extracted from the earth. It is stored under high pressure, approximately 200–250 bar. It is a cleaner fuel than LPG, and significantly cleaner than Petrol or Diesel. Its logistics are more demanding and less efficient, and the infrastructure is more expensive than that for LPG. However, it offers a lower fuel price in regions where it is naturally abundant.
• LNG (CH4): Liquefied Natural Gas. It is the same gas as CNG but, instead of high pressure, it is cooled to –162°C and stored in liquid form, which significantly reduces its volume. Due to its form, a small LNG tank allows for a long driving range or long engine operation time. It is frequently used in heavy-duty transport.

ZAMEL offers conversion systems for all three fuels. Contact us to find the right solution for you.

Yes, an LPG system can be installed in a turbocharged car. This is one of the most common myths in the industry — the idea that turbo engines and gas do not mix. In reality, most modern turbocharged engines can be effectively and safely adapted to run on gas.

• What is different in a turbo engine: A turbocharged engine operates at higher pressure in the intake manifold than a naturally aspirated engine. This requires a higher-capacity reducer — in some cases, even two reducers are needed. The injectors must also be selected to match the higher fuel demand under full load.
• What to watch out for: Proper system calibration is critical. A gas mixture that is too lean at high RPM can cause an increase in combustion temperature, which is harmful to both the turbocharger and the valves. Therefore, installation in a turbo engine should be performed by a certified workshop with experience in this type of system.
• GDI/TSI engines with turbocharging: For engines that combine turbocharging with direct fuel injection, a controller dedicated to direct injection (DI) is required. The system consumes a small amount of petrol while running on gas to cool the injectors — this is a normal function of the system, not a fault.

ZAMEL offers components and kits specifically dedicated to turbocharged engines. Contact our technical team with your engine code, and we will select the right solution for you.

The ZAMEL KIT contains all components needed to install a complete gas system — excluding the gas tank which is selected individually for each vehicle.

Components included in the kit:

• Electronic control unit (ECU)
• Gas injectors
• Reducer
• Gas valves
• Gas filters
• Gas flow hoses and pipes
• Filling valve
• Essential installation accessories

Why a kit rather than individual components: All elements in the kit are matched and tested as a complete system — ensuring full compatibility between components and eliminating the risk of incorrect part selection. It is a ready-to-install solution in one box that reduces installation time and simplifies the ordering process.

Different kits for different applications: The kit versions differ in components depending on the engine type and application — different kits for petrol engines with indirect injection, for direct injection DI engines, and for power generators. Contact our technical team with your engine code — we will select the right kit for your vehicle or generator.

Yes, the ZAMEL system is compatible with most vehicles on the market — regardless of the car brand or engine manufacturer.

Which engines work with the ZAMEL system:

• All diesel engines — Dual-Fuel
• All petrol engines with sequential indirect injection (MPI) — Bi-Fuel
• Selected direct petrol injection engines (GDI/FSI/TSI/TGDI) — Bi-Fuel DI
• Hybrid engines with indirect injection (MPI) — most popular hybrid models

Direct injection engines (GDI): This is the only category where compatibility requires verification — each GDI engine code is developed individually. We continuously expand our list of supported GDI engines. Contact us with the make, model, year and engine code — we will check compatibility free of charge.

What to provide when enquiring:

• Car make and model
• Year of manufacture
• Engine displacement and power output
• Number of cylinders
• Engine code (especially important for GDI)

Zamel Grupa serves customers worldwide — we respond to enquiries in Polish, English and Spanish.

We require details regarding the engine displacement and power output, the number of cylinders, and the vehicle’s model and year of manufacture. To select a system for a power generator, we also need the engine manufacturer’s name and model. For Direct Injection engines, the specific engine code is also essential.

 Yes. This is currently one of the most cost-effective and increasingly popular trends in the automotive world. It results in the lowest possible cost per 100 km compared to any other available drivetrain. Most popular hybrids utilize engines operating on the Atkinson cycle. These units are designed specifically for efficiency and typically feature Indirect Injection (MPI). Indirect injection means the installation of the Autogas system is straightforward, cost-effective to install, and does not require the same level of petrol “split-injection” as DI engines.

Yes, our Dual-Fuel systems work with power generators regardless of brand, size and year of manufacture.

How the Dual-Fuel system works in a generator: The Dual-Fuel system burns two fuels simultaneously — diesel and gas. It does not replace diesel entirely but aims to substitute 50–70% of diesel consumption with gas. Diesel remains essential for ignition — gas reduces fuel costs while maintaining full generator power and reliability.

Which generators we support:

• Generators up to 500 kVA — installation with a standard Dual-Fuel kit
• Generators above 500 kVA — system customised for the specific generator, always possible
• All brands and models of diesel generators
• Stationary and mobile generators

Contact us — we will prepare a free savings calculation for your generator.

In Direct Injection (DI) engines, the injector nozzles are located directly inside the combustion chamber. Petrol flowing through the injector absorbs heat from it. Without this flow, the injector tip could melt or deform due to the extreme temperatures within the cylinder. Therefore, a small amount of petrol is necessary to cool the petrol injectors while the engine is running on gas.

Our systems are developed to be as user-friendly as possible for the installer. They feature functions such as auto-calibration and map saving. To help you master our systems, we organize technical training sessions (concluding with a certificate) for those without prior experience. For experienced installers who are new to our system, we offer dedicated online support during the installation process.

Yes. Our technical team provides remote assistance during installation—we can connect to your computer online to help optimize system parameters in real-time. We are also available for video calls to discuss the installation of mechanical components. Furthermore, we act as a Technical Partner for large-scale fleet projects, where our team supervises the installation process directly at the client’s facility.

If necessary, we can remotely connect to the installer’s computer to assist with system calibration, fine-tuning, and troubleshooting to diagnose any issues. While we cannot physically repair mechanical components remotely, we work closely with the installer to provide expert guidance on the necessary corrective steps.

Absolutely. Our goal is to ensure you receive exactly what you need. Technical consultation and component selection for specific engine types are part of our daily operations. In addition to our standardized KITs, we can collaborate with you to create a tailor-made solution specifically adapted to your requirements.

We provide a warranty ranging from 12 to 24 months (or up to a specific mileage/operating hour limit, whichever comes first) for mechanical components. ZAMEL controllers are covered by a 24-month warranty. If you need information regarding the warranty period for a specific component, please contact our team for details.

The customer notifies us of a product defect and receives a claim form to complete. This form, along with the defective product, is then sent to our address. The product is verified by our technical department; if the defect did not result from improper use, the item is either repaired or replaced with a new one. For long-distance logistics, the process and shipping costs are determined individually with the partner. For shorter distances, shipping is initially covered by the customer and subsequently refunded if the claim is approved.

We maintain an inventory of over 2,000 products available for immediate shipping. Orders involving items currently out of stock are typically fulfilled within 2–4 weeks. Once payment is received, order processing and dispatch take 1–3 business days for courier and air freight, while the consolidation of large-scale orders may take up to 2 weeks. We provide an estimated lead time to the client prior to every order.

Within Poland it is usually 1-2 business days. Deliveries within the European Union – 2–5 business days, while air freight out of the European Union takes 5-10 days. Sea Freight is estimated for 28–50 days. We provide detailed estimates for both processing and transit times before finalizing any order.

Currently, we do not have a minimum order quantity or a minimum transaction value. We will provide full details regarding the logistics costs associated with your order beforehand. The decision regarding the economic feasibility of the shipment remains with the client.

For maritime deliveries, we offer the flexibility for either ZAMEL to organize the transport or for the client to arrange it independently. Most commonly, we operate under EXW terms when the client manages the transport, or FOB, CFR, or CIF terms when we are responsible for the shipping arrangements.

Import duties, all local charges related to the shipment, and the legal responsibility for the entire import process lie with the client. While we can provide guidance and assist the client through the shipping process, we do not assume liability for potential issues regarding customs clearance or the introduction of goods into the recipient’s local market.

Standard documentation provided includes: Bill of Lading (B/L), Commercial Invoice, EUR.1 and Waybill. Upon special request, we can also provide other essential import documents, such as a Certificate of Origin, Certificate of Conformity, product homologations, and a detailed list of serial numbers for the items in the shipment. Please notify us of your specific requirements before the order is processed.