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Fuel Doctor Fuel Conditioner is specifically formulated for Diesel, Petrol and Two-stroke fuel systems to clean gums, varnish and carbon deposits, disburse moisture, kill and disburse microbial material whilst increasing lubricity.

The by-products of Fuel Doctor’s formulation are increased thermal efficiency equating to a nominal increase in power, economy plus a decrease in particulate (unburnt fuel).

Fuel Doctor breaks fuel contaminants into sub-micron particles allowing them to pass safely and harmlessly through the fuel system to combustion, with no detrimental effects to fuel pumps, injectors catalytic converters or particulate filters.

Fuel Doctor will stabilise and extend fuel storage life for up to twenty four months for petrol and five years for diesel.

Specialist fuel tank cleaning

Fuel Doctors specialise in fuel tank cleaning, established in 1994, our initial focus was the cleaning of underground fuel tanks for emergency power generators in the high-rise buildings of Brisbane’s central business district, the next phase of our business included the de-sludging and cleaning of underground tanks in service stations, truck stops and marinas.

Underground, emergency power generator fuel tanks have a man way access for cleaning, service stations, truck stops and marinas do not, consequently Fuel Doctors had to develop a new system of cleaning, leading to the in-house formulation of Fuel Doctor fuel conditioner/tank cleaner, that we use as a tool of trade in conjunction with filtration and centrifuges to clean inaccessible fuel tanks.

The cleaning of Inaccessible fuel tanks in emergency generators, boats, earthmoving equipment and agricultural machinery over the past twenty-four years has kept us abreast of Australia’s ever-changing fuel quality, whilst providing the hands-on research and development necessary to ensure Fuel Doctor Fuel Conditioner meets the needs of all fuel consumers.

Research indicates that we are the only fuel additive manufacturing company in the world that makes its own fuel system cleaner and uses it on a daily basis to generate eighty percent of its income through the cleaning of fuel tanks.

No marketing hype, snake oil or smoke and mirrors here just consistent diligent attention to detail and hard work has given Fuel Doctors a credible edge in a very competitive industry.


  • My husband and I have a 45 foot yacht with a Yanmar 75hp diesel motor. We are currently situated in Malaysia. Unfortunately Fuel Doctor is not available over there and none of the substitutes come even close to the performance of Fuel Doctor. To the contrary they cause more problems than they fix. Thanks and Regards, Helen
  • Always been sceptical of these types of products. Just started using Fuel Doctor in a 30 year old Land Rover with 600k plus on the clock. Virtually eliminated smoky exhaust under load, holds better on hills. Brilliant product! Barryfrom Cape York
  • Just wanting to thankyou for the box of miracle fluid! I've been using in my hiace van which was burning oil from a sticky gummed up ring and it's now not burning oil and getting 8-9 litres per 100km approx 2-3 lph better. Brad
  • Ford Australia could not fix the ticking noise in my 2016 XLT ranger have been putting up with noise for 30k km and has been to ford dealer 5 times and has not been fixed. I have used fuel doctor for 3 tanks with initial heavy dose and the ticking has gone completely gone. Highly rate this product I now enjoy driving my Ranger again - Brad from Gold Coast
  • "I have religiously used Fuel Doctor in my 80 Series Landcruiser for around 15 years, recent complete draining of both tanks via the bottom drain plugs revealed absolutely no foreign matter present either in the form of water or other contaminants – a great result!!!! At more than 330 000 km on the original injectors the engine still starts instantly It blows virtually no smoke and still gives great economy and performance – a great result!!!! " - David from Sydney
    Rene Descartes
  • "Thanks for all your help and advice with the fuel on the 52 foot boat. The trip from Coffs to Sydney with a stop over in Newcastle was smooth sailing and boat performed exceptionally well." - Phillip from Pacific Boating
    Rene Descartes
  • "Thank you for your quick response in rectifying the contaminated diesel. Our machines were up and running for first thing Monday morning" - Peter Leonard Manager at All Roads
    Rene Descartes
  • "I’ve been using Fuel Doctor over the past 10 years in my boat, a 36 foot Riviera with Twin Cummins 330 diesel engine with a 1200Ltr fuel tank. I would thoroughly recommend it to anybody" - Ian from Manly QLD
    Rene Descartes
  • "When I read on the bottle of Fuel Doctor that I would be impressed I thought here we go again but what the heck, I'll give it a go. I'm not just impressed I am bloody impressed." - Dean Francis from Redland Bay QLD
    Henry Ford
  • "I've tried other brands like Nulon, Flash Lube and other fuel treatments but now I use Fuel Doctor in two of my vehicles and my boat and I’m totally blown away. My Nissan Pulsar before treatment was getting 540km per tank after just 1 treatment I'm getting 740km My Toyota Prado before treatment was getting 980km from 180 litres of fuel, after 1 treatment 1159km per tank, after 2 treatments 1398km per tank! Keep it up guys!" - James Duncan from Redland Bay QLD
    James Duncan
  • "Have used other injector cleaners with no results or improvement, After using your product, It’s remarkable." - Ray Turner from South Australia
    Ray Turner

Frequent Asked Questions

First time usage?
For vehicles with fuel tanks of less than 500 ltrs, where practical it is recommended to initially drain or pump any free water from the tank bottom, then treat at one litre Fuel Doctor per 100 ltrs or less of tank capacity per 100,000 kilometres the vehicle has travelled.

Example: vehicle has a 80 litre tank and has travelled 200.000 kilometres, treat with one litre of Fuel Doctor on two consecutive tanks, then ongoing at one millilitre per litre of fresh fuel.

Over Treating?

It is impossible to over treat with the Fuel Doctor, while we recommend following the treatment guidelines, Fuel Doctor is formulated so that it will not harm your fuel system or engine if you use more than recommended amount.

Contact us for further information.

Common rail diesel, diesel particulate filter?

Empirical and anecdotal evidence shows that Fuel Doctor decreases particulate material (unburnt fuel), numerous charter boat companies and bus companies have noted a substantial decrease in soot accumulation on the rear of buses and the transoms of boats, consequently consistent use of Fuel Doctor will decrease particulate build up in DPF’s.

Numerous tilt ray operators in Brisbane have noted that constant use of Fuel Doctor has dramatically reduced the frustrating regeneration cycles that have disrupted their cash flow.

Contact us for further information.

What does it do with the water and fungal material?

Fuel Doctor breaks the water and microbial molecules into sub micronic particles that are encapsulated into the detergent (Fuel Doctor) matrix allowing them to pass harmlessly through the fuel system to combustion.

Contact us for further information.