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Dual Fuel Systems. Running Petrol and Gas. How LPG conversion Kit is Fitted on Australian Ford Falcon Car

Updated on January 19, 2018
agvulpes profile image

Worked in the Auto industry for nearly 50 years and through experience and training in electronics acquired much knowledge on vehicles

Ford Falcon ( Australian Model )

Ford Falcon,running successfully on a Dual Fuel System for over 10 years!
Ford Falcon,running successfully on a Dual Fuel System for over 10 years! | Source

Dual Fuel - Petrol and LPG (Liquid Petroleum Gas)

It was way back in the 70's when I had my first Dual Fuel car. LPG is a much cleaner burning fuel than petrol as we call it here in Australia or Gas as it's called in other places!

Around that time I could see that the cost of petrol and diesel was about to soar forcing vehicle running costs up and the then relatively new technology of Dual Fuel was emerging. There was only a few cars on the road with dual fuel.

The then Natural Gas supplier called "Gas and Fuel Corporation" was experimenting with Dual fuel. Initially it was to be CNG (Compressed Natural Gas) and Diesel. but later they switched over to CNG and Petrol as the Dual Fuels of choice. However I could see that the Petrol Companies would not be at all happy with CNG but LPG (Liquefied Petroleum Gas)would be much more profitable for them.

With this in mind I went to the expense of converting my 6 cylinder Falcon to Dual Fuel (Petrol + LPG). This was done using a LPG Gas conversion kit.

Since that day I have always had at least one vehicle running on the Dual Fuel System.

If you bear with me I will try to explain why and you may decide to do the same!

Reasons to convert to Dual Fuel

If you are anything like me I get brain numbing and my eyes glaze over with all the numbers and chemical equations being thrown around these days! So I will only give you my own experience that has covered a span of about 35-40 years most of these I may add working in the Automotive Industry ,selling, installing and repairing Automotive Service Equipment.

One part of my job was to calibrate and repair the "Dynomometer" on which the Gas and Fuel tested their prototype buses and vehicles!

I will list the 3 main reasons that I switched to Dual Fuel:

  • Rising fuel costs.
  • Shortage of petrol.
  • Environment.

Recent receipt for Fuel both Petrol and LPG
Recent receipt for Fuel both Petrol and LPG | Source

Ford Australia Ute

Ford Australia have a range of Falcon Vehicles like this Falcon XL / XLS / RTV Ute available to run on LPG!
Ford Australia have a range of Falcon Vehicles like this Falcon XL / XLS / RTV Ute available to run on LPG!

Fuel Analogy

Rising Fuel Cost:

With the cost of petrol being what it is today and going up nearly on a daily basis ( in Australia today it is selling at about $1.21/ litre . I can buy LPG today at the local Service Station for $0.52 / litre. A copy of the receipt is in the diagram.

Using my own 6 cylinder Ford Falcon as an example, I have calculated from the purchases of fuel that the fuel consumption is close to 17 litres/ 100km (oddly enough is 17miles/gallon +/-)

Now if we calculate the cost of fuel using the average annual distance traveled in the United States of America.

The latest figure I could find is in 1993 the average was 17862 km ( 11,000 miles approx).

My guess is that the figure of 11000 miles is very conservation but I will base my calculations on the figures and you can calculate the savings based on the figures for your own vehicle type and distance traveled.

Table figures:

If you study the figures on the table below, you will see that there is a saving of over $2000 by using LPG against Petrol. Even allowing for a bit of give and take this is a very nice saving. One which I am benefiting from right now and have been since the 70's.

Total Saving
Amount of fuel used
3026 litres
Petrol cost @ $1.209/litre
LPG cost @ $0.515/litre
Savings of LPG over Petrol
Calculating cost on a distance traveled of 17862 Km in one year, at a consumption rate of 17 litres per 100 Km

Shortage of Petrol

This reason should be pretty well self explanatory!

I would think that every one would know and understand that our petrol supplies are dwindling at an alarming rate!

When my first car was converted to Dual Fuel the petrol here in Australia was actually being rationed and we could only get $20 worth of petrol every other day.

Fortunately these days are gone but who knows in the future it could happen again. It is my honest opinion that any sovereign country should not have to rely on imported fuel for survival.

I have written another hub on my version of "The Pickins Plan". A plan devised to remove Americas reliance of imported oil. The plan has many detractors but I believe that this style of plan should be the base of all major countries to stop their dependence of Foreign Oil. I have written a summary of the plan down further in this article.

Environmental Issues:

Each day I believe that we are all becoming more aware of the environment.

Whether you think that global warming is a real issue or not, knowing that our cities are being choked by fumes from vehicles should be a matter of major concern!

It has been proved that LPG is about 80% cleaner burning fuel than petrol and diesel.

Used in a vehicle that has been properly designed or modified for it's use, LPG is much kinder to your motor.

When my mechanic changes the oil in my car he is amazed just how clean the old oil is after he has removed it from the engine.

LPG / Petrol Indicator

LPG to Petrol change over button mounted in the dashboard
LPG to Petrol change over button mounted in the dashboard

LPG / Petrol Fillers

LPG and Petrol filler caps fitted together securely!
LPG and Petrol filler caps fitted together securely!

LPG Tank

LPG tank inside the boot of our Ford Falcon
LPG tank inside the boot of our Ford Falcon

LPG Diamond Number Plate Indicator

 A red diamond inscribed with LPG is required by Law in Victoria. It must be fitted to both front and rear number plates.
A red diamond inscribed with LPG is required by Law in Victoria. It must be fitted to both front and rear number plates.

Outward Appearance of Modified Vehicle

Appearance of the Vehicle after having a Dual Fuel Conversion

After a vehicle has been modified to run on a Dual Fuel system there is very little alteration to the appearance of the car the main points being:

  • You will notice inside on the dashboard an extra button. When the light is 'on' in the button it indicates that the car is running on LPG. When the light is 'off' the vehicle is running on Petrol.
  • Another thing you will notice is when you fill up with LPG or Petrol. There is no mistaking which is which. The petrol tank is a hole that accepts the nozzle of the petrol pump.
  • The LPG fill is a screw on fitting similar to a very large screw on jar cap.
  • In Australia it is law that we indicate that a vehicle has LPG fitted and this is done by the use of a small red diamond sticker with LPG in the center.
  • This diamond is placed in the middle of both front and rear number plates.
  • The other big difference in most sedan cars is the loss of space in the boot where the gas tank is placed. If it is fitted as mine is in the boot you cannot lay the rear seats down and it does reduce the amount of available space in the boot. However this is a penalty I am prepared to endure for the benefits gained by have the car run on LPG.

You will get a fair idea on how these look if you study the diagrams . If you click on each diagram you will get a larger image showing each point.

Vehicle Manufacturing Around the World

The following figures should give you an understanding why we need to do something about limiting the amount of petroleum products we are consuming at an ever increasing rate.

According to OICA at the end of 2009 there had been over 60 million vehicles manufactured around the world! And that is just one year!!!! Here are just some of the numbers:

  • China 13+ million ( now highest manufacturer of vehicles)
  • Germany 5+ million
  • Japan 7+ million
  • USA 5+ million

That is just the vehicles that were manufactured in one year . How many vehicles would actually be driving around on the road.

The Pickens Plan is it Viable ?

The Pickens Plan.

During my research for this Hub I rediscovered a man who I happened to hear about during the last presidential election campaign in America . This man's name is T.Boone Perkins and he has developed a plan that some would call visionary.

As I see it his main point is to make America self sufficient in supplying all of it's own fuel needs!

There are several different paths to the Pickens Plan:

One of these paths is the use of Natural Gases including LPG to remove the dependence of America (in my case read the world) on the use of imported oil (in my case just read "oil").

This would entail the conversion of millions of ICE powered vehicles that are causing the problem already !

There are more details about this on my Hub:

The Pickens Plan

Quoting President Obama:

"And for the sake of our economy, our security, and the future of our planet, I will set a clear goal as president: In 10 years, we will finally end our dependence on oil from the Middle East." — President Barack Obama

— President Obama

President Barack Obama quote

Quoting President Obama:

"And for the sake of our economy, our security, and the future of our planet, I will set a clear goal as president: In 10 years, we will finally end our dependence on oil from the Middle East." — President Barack Obama

Australian Ford Falcon available from the factory with a dedicated LPG engine.
Australian Ford Falcon available from the factory with a dedicated LPG engine.
E-Gas engine fitted to Australia's Ford Falcon
E-Gas engine fitted to Australia's Ford Falcon

Progress in LPG

Ford Australia

To give you an indication of the advances made here in Australia. Ford Motor's subsidiary Ford Australia has for a number of years been manufacturing a Ford Falcon E-Gas model.

This Ford Falcon E-Gas model has a dedicated LPG engine which is a 6 cylinder engine, 4.0 litre delivering a claimed 156 kW and runs solely on LPG. This model is available as a Sedan, wagon and utility workhorse. The vehicle is built to the very strict Euro lll emissions guidelines.

Ford America

Early this year Ford told some top fleet purchasers that it will be introducing a propane (LPG, or Liquefied Petroleum Gas) engine package for its 6.8-liter F-450 and F-550 Super Duty chassis cabs in the near future!

Peter's Program

You may have read about the Pickens Plan, well I have one of my own it's
"Peter's Program" and based on how I was able to afford my first Dual Fuel LPG - Petrol conversion.

It would require the implementing by top Government but I am convinced with some tweaking on things that I know nothing about it would work.

So in easy steps here is Peter's Program:

  • Any oil company prepared to enter the Program will receive a rebate on duties
  • On entering the program the company pays for the LPG dual fuel conversion on any vehicle capable of being modified. (engine evaluated for wear, age compatibility etc.)
  • the Owner of the vehicle then enters a contract and agrees to pay a certain amount per month levy on the gas usage of the vehicle every time the car is filled with gas.
  • This amount would be no more than what the owner would pay running on petrol.
  • (if an agreed amount is not reached the owner tops up the payment every month. (This should be easily controlled by the use of a Plastic card. (Similar to an award scheme we have in Australia)
  • Depending on the distance traveled and the amount of LPG consumed the conversion could be paid for in a span of 12 -24 months.
  • This is a win - win for all. The Owner gets a Dual Fuel - LPG Petrol conversion for virtually nothing (they would have been paying out for the cost of petrol) and the Fuel Company is getting customer loyalty.

LPG Tank with gas tight cover removed.
LPG Tank with gas tight cover removed.

Under the Hood

Under the Hood
Under the Hood

Under the Hood

It all fits in there somehow!
It all fits in there somehow!

LPG Converter

Vaporizer (converter) mounted under the bonnet
Vaporizer (converter) mounted under the bonnet

Would You Convert to LPG

Based on this Article would it be viable to convert your vehicle to LPG

See results

© 2010 Peter


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    • agvulpes profile imageAUTHOR


      6 years ago from Australia

      @muhammad asif , unfortunately I do not have the qualifications or experience to help you at all on the technical side of Dual Fuel Systems.

      In my opinion you should consult a Mechanical Engineer who has had some experience in converting vehicles to Dual Fuel both Petrol to LPG and Petrol to CNG. The consequences of getting a job like you are asking wrong are dire and should not be tackled by the inexperienced :)

    • profile image

      Muhammad Asif 

      6 years ago

      Reply at gmail

    • profile image

      muhammad asif 

      6 years ago

      8300 cc and 240 hp fitting in my bus EFI sys oprating injectors on CNG injector directely spraying before throttle 8 injectors installed at 6cylinder engine two injectors working at same time system is controlled by ecu if we change the system to fuel (petrol) what will be the requirements to modified the system from CNG to fuel (petrol) now CNG crises raise up I want to Chang system on petrol I. Am auto electrician in Punjab ankai motors in Pakistan the buses co said you do some thing well have 3500 buses I am. Awaiting your good respons

    • agvulpes profile imageAUTHOR


      8 years ago from Australia

      Hi MANJAPPA - Unfortunately I don't have any knowledge of the motor industry service shops in Bangalore. I do know that here in Australia there are many privately owned workshops where an owner can have their vehicle serviced and still retain the warranty. Even a car with a dual fuel system is possible to be serviced :-)

    • profile image


      8 years ago

      I am living at bangalore and i have ford ikon car ,i converted to LPG .car running at good condition. But car which is coverted to gas will not allow to service at ford show room . What can i do ,where i have to get service ?

    • agvulpes profile imageAUTHOR


      8 years ago from Australia

      It sure is worth converting to duel fuel (LPG).

      Due to heavy kilometre use this month I reckon I have saved at least $300 by using LPG rather than petrol.

    • sjain101 profile image


      8 years ago from Delhi

      Good and informative hub. makes sense to convert

    • agvulpes profile imageAUTHOR


      8 years ago from Australia

      Well I understand the first part of your statement but I'm not sure about the 'limitation range' Are you meaning that there are not many service stations with LPG ? In Australia I would say that 99.9% of service stations have LPG on tap. I'm not sure what sort of car you drive cos it did not translate correctly. However I think you should do the math and I think you will find that it is economically sound to look at the dual fuel systems LPG conversions :-)

    • profile image

      μεταχειρισμενα αυτοκινητα 

      8 years ago

      the good thing about about LPG it is environmental friendly

      but then the limitation range is the disadvantage.If only there a technology that would discover to make a wide range it would be much better.Currently I own an ?????????????? ?????????? and i still can't decided whether to convert or not.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Wow I had know idea it was actually law for your commercial vehicles to run on CNG, what a great way to reduce the carbon footprint!

      Unfortunately Governments all over the world appear to be greedy don't they? Our Government has recently slapped a 12% duty on our LPG even though we produce that much gas we can sell it off to Japan for virtually nothing.

      I agree with you that we (the public) should be encouraged to convert to LPG or CNG. This would help to keep all of the ICEs going for longer at a smaller pollution rate.

    • sweetie1 profile image


      9 years ago from India

      Out here we have filling stations like petrol Pumps. They keep the pressure at 200 psi. Supreme court of India had ruled about 8 to 10 years back that all commercial vehicles must be run to CNG in Delhi so reduce pollution. After that it really picked up and though now it is so popular that there are lines outside CNG pumps and government as all over the world is greedy here too and has increased prices by well over 50% in last one year which is not fair because it is a clean fuel and govt should encourage people to use it and not tax it heavily.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      G'day sweetie1. I agree in principal that CNG is a better proposition than LPG and cannot understand why it has not been developed more fully here in Australia.

      There are many advantages for the motorist, some you have mentioned and another is that you can install a filling station in your home. Maybe that is the very reason that the big companies have not pushed the concept?

      Thanks so much for your insightful comment:-)

    • sweetie1 profile image


      9 years ago from India

      Hi agvulpes, Out here in Delhi most petrol cars owners have fitted their cars with CNG Kits. Not only CNG cost about half that of petrol but also give more milage ( about 50% more) . So running on CNG cost about 1/3rd of petrol. It is more clean and safe than LPG.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Hi Marty, yep I agree that being green is good. The only thing that I insist on though is that we have a level playing field and we are not subsidizing other peoples un-greenness lol

    • MartyWare profile image


      9 years ago from New South Wales Australia

      I have a dual fuel car. Also i can afford to run a six cyclinder car this way, I like the power on the highway!

      Also, I like to be green as possible.

      As technology drives in the right direction I will be driving green emmission cars for sure!

      Marty Ware

      The SEO DAD & the creator of the Hubpages Tribe

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      You have raised a good question! LPG is as safe as any other fuel when handled in the correct manner. If the installation is done according to standards that are set by the Standards Authority there is very little chance of Gas escaping into the cabin. As far as the fuel exploding in a collision, there is less likelihood of a LPG gas tank exploding than a petrol tank due to the fact that LPG tanks are constructed more solidly than petrol tanks and LPG has a lot higher 'ignition' point than petrol! I do not know the effects of 'sniffing' LPG compared to Petrol but I do know that LPG is not decantable so is not likely to be used as a 'sniffing' agent like petrol and spray paint!

      So, and it is my opinion only mind I would think the safety factors come down on the side of dedicated LPG or Duel Fuel Systems.

    • profile image


      9 years ago

      Is LPG safe, is it not risky is inhaled inside the vehicle?

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Well mate, saving some dollars, then if you have not already, and of course if you have a vehicle lol, you should be looking into having said vehicle fitted with a Dual Fuel System. :-)

    • carolina muscle profile image

      carolina muscle 

      9 years ago from Charlotte, North Carolina

      I'm all for saving $$$$$ !

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Darlene Sabella, the cost of converting to Dual Fuel in Australia does have a subsidy paid by the Federal Government. I believe at this stage it is only available to private individuals and sedan motor cars.

      Thanks again for you kind words of support :-)

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      earnestshub thanks so much for your kind words. I am not too sure if sane and rational are in the Governments vocabulary right now? More like "how can we win the next election?" It is a pity that the Governments of today did not get down to the grass roots and listen instead of just giving us the platitudes that they are doling out.

      Just think of the saving in oil if only half of the vehicles on the road were converted to a Dual Fuel System?

    • Darlene Sabella profile image

      Darlene Sabella 

      9 years ago from Hello, my name is Toast and Jam, I live in the forest with my dog named Sam ...

      Excellent hub, we all need to think this way, the cost of conversion is so expensive for the adverage guy, thanks for your wise advise on this topic...thumbs up

    • earnestshub profile image


      9 years ago from Melbourne Australia

      A brilliant hub this one!

      You offer a sane and rational way forward for the whole fuel industry.

      Dual fuel systems or dedicated LPG conversion is the way to go, and the scheme you suggest to pay for it makes heaps of sense.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      G'day Eric of course you are right. Maybe we could go in and run an extension lead to our own tankers :-)

    • Eric Graudins profile image

      Eric Graudins 

      9 years ago from Australia

      I've had a couple of LPG cars, and they were very economical.

      The wasted gas that is flared off from oil production platforms all around the world would probably power most of world's cars. Pity that they don't think it's worthwhile to capture it.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Ann Lee thanks for your comment! It would be great if all of the people who run our countries could actually work out something that benefits the "Country" not so much the "company" :-)

    • Ann Lee profile image

      Ann Lee 

      9 years ago

      Sounds like a good plan

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      Yes you are quite correct but I think is would be desirable for one of the fuel to be economical and environmentally friendly as in the LPG (Liquid Petroleum Gas)

      Thanks my friend for dropping by :-)

    • dahoglund profile image

      Don A. Hoglund 

      9 years ago from Wisconsin Rapids

      It would be desirable to have vehicles that run on various fuels.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      @sweetiepie thank you for your continued support, it is very much appreciated. I hope that I have been able to pass on my experiences to enable more people to make a considered and balanced decision on installing a Dual Fuel system.

    • agvulpes profile imageAUTHOR


      9 years ago from Australia

      @psychicdog thanks for the comment. I feel you are correct I drove taxi's way back when and they were nearly all running on LPG at the time. LPG then was only about 5 cents a litre, and contributed very little in the overall running of the vehicle. I your vehicle a large one or a sedan?

    • SweetiePie profile image


      9 years ago from Southern California, USA

      Very conscientious and well thought out hub. It is nice to hear about the many alternatives there are out there to simply using a gasoline fueled car.

    • profile image 

      9 years ago

      Great. My work vehicle is on dual fuel. I notice most Taxi companies use it too and whatever choices they make are usually ahead/forward thinking.


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