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Frequently Asked Questions

The idea of injecting gas as a secondary fuel into diesel engines is as old as the diesel engine inventor himself. Rudolf Diesel promoted that his diesel engines would operate better using marsh gas (now natural gas) and this idea has been practiced widely for many years.
LPG used in conjunction with diesel benefits both your engine through lower running costs and your wallet by increasing the life expectancy of your engine.
Why Gas?
Why not gas??? 

The Gas On Diesel® LPG Vapour Injection System is controlled, activated and proportionate to the boost pressure from the turbo.
Gas On Diesel® allows for a small flow of LPG when the vehicle is at idle. This is particularly suitable for heavy vehicles whose engine run while loading, garbage collection trucks, tow trucks, cement mixers or any vehicle where the engine runs for an extended period while stationery.
For all other vehicles this adjustment can be closed so the unit simply runs in driving mode only.
Gas On Diesel® begins the flow of LPG gradually when the preset turbo boost is reached and as the boost increases, so does the volume of gas.
Gas On Diesel® is a mechanical system. There are no computers or stepper motors. The system does not require any permanent modifications to the Engine or Fuel Management Systems.
This innovative design is only activated when the vehicle’s ignition is on and its‘ engine is running.
The system installs either under bonnet or under vehicle and requires no permanent modifications to the vehicle or engine.
Its’ innovative design and safe, mechanical method of LPG delivery is what makes this system unique to others.
Gas On Diesel® overcomes many of the drawbacks encountered with earlier designed LPG systems.
LPG is only injected when the boost reaches our preset poundage (this may vary for each engine and usage).

There are two main systems available. These are mechanical and computerised.
Both systems have their benefits but, for the sake of reliable simplicity, we believe that a mechanical system such as Gas On Diesel® is far more user friendly. The Gas On Diesel® system is mechanical and uses the vehicles’ boost pressure to drive a diaphragm to control the exact amount of gas required.
Many of the computerised systems contain complicated mixers and/or sensors that have to be installed on the engine and the system adjusted using computer programs.

Many companies will tell you this and suggest that the addition of LPG into the mix will give you a more complete burn. This is simply not true! If only 75% of the diesel entering the combustion chambers was used, you would most likely see a trail of diesel following the vehicle from the exhaust.
Although diesel is a more efficient fuel than petrol, it is true that not all the fuel is burned during combustion and so not all the diesel is burned completely.
This results in deposits of carbon on the cylinder walls which can be mixed with the oil as it lubricates and cleans the cylinders, carrying the carbon into the sump. Carbon can also be found deposited on the valves, injectors and even glow-plugs or can be burned in the exhaust causing black smoke emissions.
LPG acts partly as a catalyst when combined with diesel fuel allowing the fuel to be combusted more efficiently thereby avoiding the aforementioned problems. LPG is also combusted as a fuel in its' own right providing better fuel economy with an increase in both torque and horsepower with fewer emissions.

This will vary depending on the vehicle and driving style and whether the system is tuned for maximum economy or primarily for power increases. You can expect an increase in torque and horsepower of anywhere between 10 - 25%

Gas On Diesel® can be tuned a number of ways and so it depends on the way you want the system tuned and what type of vehicle it is being fitted to. Generally, the larger the engine, the more you can expect as an economy percentage gain when tuning for economy.
Even if you are after a power tune you will still experience better fuel economy.

Gas On Diesel® will definitely give you the torque you need to make towing or hauling heavy loads easier. You will find that not only towing but also climbing hills with or without a load, you will not be downshifting gears as often as you were without LPG.
IMPORTANT... Never tow more than what your vehicle and trailer are rated for.

Gas On Diesel® is perfectly suited to work in conjunction with other performance enhancing products. This simply involves tuning the Gas On Diesel® system to the set-up of the vehicle.

The Gas On Diesel® system has been designed to maintain OEM specifications for all engine temperatures including engine coolant temperature, oil temperature, exhaust gas temperature and intake air temperature.

Across the range of various LPG fumigation systems on the market, increases of no more than 50ᵒC or less have been reported. In many cases however, instances of lower EGT's have been reported.
In some instances, temperatures are actually reduced by around 50-100 degrees.

All new diesel vehicles are now fitted with a diesel particulate filter to help trap and burn off harmful diesel smoke emissions. These filters often fail to reliably work as they were intended. Diesel is a very dirty fuel which is slow burning, and causes excessive soot (unburned fuel), even under normal conditions, to be expelled out of the exhaust. The DPF captures and stores all these dirty diesel particulates and, all being well, rids itself of them periodically when the ECU initiates a controlled regeneration process. Regeneration is where the captured soot is re-ignited and burned in the exhaust, creating even more carbon dioxide than the car manufacturers publish in their emissions figures. Most vehicles fitted with a DPF will eventually suffer from a blockage leading to power loss, excessive fuel consumption or total failure, rendering the vehicle undriveable.
Running a diesel vehicle on a mixture of gas and diesel can greatly reduce these particulate emissions and, any soot captured inside the DPF will be drier and the particulates smaller, than it would with diesel alone, making any regeneration much more likely to succeed.

Power switch/ LPG level gauge inside the cabin so the driver has full control of turning the system on or off.
LPG lock off solenoid which stops the flow of gas unless the ignition and system are turned on and the engine is running.
Safety Switch. This is connected to the lock-off solenoids at the LPG tank and under-bonnet, a tacho pulse pick-up point and the ignition controlled on/off dash switch. The on/off switch can be operated at any time, even while driving.
e.g. If you are driving with the LPG on and decide to turn it off (but why would you?) you will notice a drop in power but the vehicle will continue to drive on diesel alone. This is also the case if you run out of LPG; the vehicle will continue, uninterrupted on diesel alone.
NO POWER - NO GAS
NO PULSE - NO GAS
NO BOOST - NO GAS (except when it is set to operate with the vehicle idling)