Got Questions? Want to know how to use Fuel Doctor, who makes it, how it works, why do you need it, or see it live in action? Our Frequently Asked Questions below are full of the answers you’re looking for, including information on our shipping, warranty, and returns policies.
We update these FAQ often, but if you can’t find what you need, please contact us.
Fuel Doctor is a 100% Australian made fuel conditioner originally formulated to clean all types of fuel in inaccessible industrial underground storage tanks. As such, it is effective in all diesel, petrol, and two-stroke fuel systems.
Put simply… Fuel Doctor cleans and protects your entire fuel system while giving optimum combustion and minimum pollution every time you use it. And, as an added bonus, it will also stabilise and extend the life of fuel in storage tanks or jerry cans for up to 5 years.
For more details, please see: “How does Fuel Doctor work?“
Fuel Doctor Fuel Conditioner is a proprietary formula of oxygenated molecules, which work to break down fuel contaminants (such as water and fungal material) into sub-micronic particles, and emulsifiers which take those particles and disperse them into the fuel. These particles are then able to pass through your fuel system, without causing any harm to your fuel pump or injectors. It helps to protect your engine by lubricating any microscopic solid particles which are then able to pass through your fuel system and upper engine.
It will also dissolve carbon, gum, varnish, and other built-up contaminants in your fuel lines, fuel pumps, carburettors, injectors, and on valve faces, taking them through combustion safely.
Fuel Doctor is unlike any other fuel additive, because it’s used by the Fuel Doctors™ every day as a tool of trade so you can trust that it works.
Dirty fuel is any fuel with contaminants in it. This means that almost all fuel is “dirty”. Around 80% of underground fuel tanks have water in them. Water provides the oxygen source for fungal spores (Cladosporium resinae) to grow and consume their favourite food—the hydrocarbons in fuel. Water from condensation also promotes flash rusting of underground tanks, which flakes off into the fuel, unleashing abrasive particles.
When a road tanker delivers fuel to your local service station, it fills their underground tanks at 800-1000 litres per minute, stirring up the existing debris and agitating the contaminants in the tank, mixing them into the fuel. As a result, you can never be sure what contaminants are in the fuel you buy.
If you buy any amount of fuel any time up to two days after a road tanker has filled a service station’s underground tanks, you run a high risk of the fuel being contaminated.
The immediate danger period after a tanker refill varies depending on ambient temperature and the degree of contamination already in the tank, but it’s usually 2-4 hours in summer and 4-12 hours in winter.
Many consumers are lucky and never fill up in the post-fill danger period. But every time you buy fuel, you have the potential to introduce these unseen contaminants into your fuel system.
Fuel Doctor is the simple, inexpensive answer to this problem, and provides a high level of quality assurance for any amount of fuel you put in your car (or other vehicles and machinery).
Any underground storage tank from any commercial service station, industrial storage facility, or private tanks. The dirty fuel coming from your storage tank can be minimised by treating your fuel with Fuel Doctor before use. If you need any assistance with fuel storage tanks, contact the Fuel Doctors™ directly.
In this video short from Fuel Doctors™ and 4WD Action, Jock empties the fuel tank of a 4WD that has an obvious fuel issue where the diesel is emulsified with water and other contaminants. Watch as Steve from Fuel Doctors™ turns the test sample into clean fuel and then puts it straight into his own $200,000 dollar Range Rover and takes it for a drive.
The main contaminants of fuel are water, fungal material, and rust. There is residual water in all underground tanks from new, and various factors such as engineering, maintenance, and environmental issues can cause more water to enter under/above-ground fuel tanks. Fungal material comes from spores (mainly Cladosporium resinae) that can enter the tanks any time they are opened, filled, cleaned, etc., via the breather systems that are always open. As a side effect of water contamination, rust is formed when steel and iron components inside fuel storage tanks are also exposed to air—every time the tank isn’t completely full.
While your vehicle’s fuel filter is designed to capture solids like rust and dirt particles over a certain size (usually between 2-30 microns, depending on your filter), and specialised filters can separate some water from fuel, they will generally only trap small amounts before they become overwhelmed. As for emulsified fuel and water, unfortunately the majority of filter/separators can’t tell the difference between this and clean fuel.
These are the situations where Fuel Doctor is the perfect solution.
Service stations do have particulate filters to protect their pumps from rust and other solids. However, these filters do not remove water from fuel, nor do they filter fungal material or microscopic particles of rust, because many of these contaminants are smaller than the micron-rating of service station filters.
Unfortunately, there are no signs that you are buying contaminated fuel, as the Australian fuel industry removed fuel sight glasses way back in 1986. These sight glasses were used to display the fuel as you were pumping it, so you could check the quality of the fuel you were buying. Due to their removal, most people now have no idea what clean fuel even looks like, so are unable able to assess the quality of the fuel they are buying.
Unfortunately, the first sign you’ll see if you’ve bought contaminated fuel is after the damage has already been done to your fuel system. This damage could be in the form of poor engine performance, lowered fuel efficiency, sooty exhaust, or (if you’re one of the many unlucky ones) the need to replace your injectors, fuel pump, or other engine components.
First and foremost, dirty fuel can cause damage to your fuel system and engine components simply by passing through the system. Microscopic particles of dirt and grime can clog fuel filters and injectors, reducing engine efficiency and ruining the injector spray pattern. Water is vaporised as it passes through the injectors, causing damage to the injector tips, which also ruins the injector spray pattern. In addition, water in your fuel creates the perfect environment for fungi to grow, feed, and defecate throughout your fuel system.
These abrasive contaminants then pass through the system, causing additional, unnecessary wear and tear on the components, which in turn reduces their lifespan and costs you more for repairs and replacements.
The introduction of common rail direct injection in diesel engines has created more opportunities for gum and varnish deposits to form and cause problems with fuel flow, injector spray patterns, and fuel atomisation. The higher pressure also makes it more dangerous for water and other microbial contaminants to pass through the system as they can no longer be simply burned off with a hard run of the engine, nor can the engine be de-coked by pouring water into the carburettor, as with older engines. By comparison, common rail direct injection systems will fail if exposed to less than a shot glass (30ml) of water.
Fuel Doctor Fuel Conditioner can be used with all petrol and diesel fuels, with absolutely no detrimental effects to the associated engines or fuel systems.
In fact, the manufacturers, Fuel Doctors™, have never seen any adverse effects from using Fuel Doctor with other fuels such as two-stroke, E10, E85, Methanol, and Avgas. And it’s perfectly fine to use Fuel Doctor with dual fuel vehicles that use petrol or diesel with LPG.
AdBlue® is also not affected by the use of Fuel Doctor.
Fuel Doctor Fuel Conditioner can be used in any vehicles or machinery that run on diesel, petrol, or two-stroke fuel. Anything from commercial bus fleets, massive mining machinery, and super-yachts to personal watercraft, household mowers, and chainsaws.
The potential for purchasing contaminated fuel is always present. An alarming amount of fuel storage tanks have some form of contamination or “dirty fuel”. How much and whether it will affect your vehicle depends on a lot of factors: age of the tank, lack of appropriate maintenance, temperature, volume of residual water, where the fuel came from, how long it’s been there, and of course when the tank was last filled. Because you can’t see what goes into your fuel tank, you run the risk of transferring contaminants into your fuel system and causing damage to your engine, every time you fill up.
If you value optimal performance from your vehicle and longevity of your engine, and don’t want the expense of replacing prematurely corroded and damaged components, then you need to use Fuel Doctor to treat and maintain your vehicle’s fuel system.
For cars, trucks, and busses, the recommended “shock treatment” of Fuel Doctor is: 500ml per 100L (max) fuel tank. Vehicles with an excess of 100,00kms should shock treat two or three tanks, prior to moving on to maintenance treatments.
For example, if you have a 72L fuel tank and your car has travelled under 200,000kms, you would need to use 500ml of Fuel Doctor in a full tank of fuel TWICE before moving on to the maintenance treatments.
The recommended maintenance treatment ratio of Fuel Doctor is 1ml per 1L of fuel. So for example if you topped up with 25L of fuel, you would need to add at least 25ml of Fuel Doctor to your tank, preferably before adding the fuel.
For marine applications you should double the shock treatment ratio. So, use 1L of Fuel Doctor per 100L of fuel. Repeated shock treatments may be required until your fuel runs clear in your fuel sight glass. Only move on to the maintenance treatments once your fuel appears clear.
The maintenance treatment ratio for marine applications is either: 50mls per 100L for working craft OR 100mls per 100L for recreational craft.
Note: severe contamination may require several shock treatments.
According to the Fuel Doctors™, “over-treating” with Fuel Doctor Fuel Conditioner will have no detrimental effects to fuel system components.
Fuel Doctor only treats the fuel you put it in, so when you buy more fuel, you are potentially introducing a new batch of dirty fuel into your system. Using the recommended maintenance treatment of Fuel Doctor every time you add fuel prevents the unwanted and costly side effects of putting dirty fuel through your car’s engine and fuel system.
Due to its unique formulation, using “too much” Fuel Doctor (i.e., using more than the recommended shock or maintenance treatment) will not harm your engine or fuel system. In fact, Steve from Fuel Doctors™ suggests that using a little more is far more beneficial than using a little less.
Fuel Doctor is specifically formulated to do no harm to your tanks, engines, and fuel system components. In fact, one of its primary goals is to add lubrication to your fuel, which reduces pump, injector, and engine wear.
Most fuel filters are designed to filter out solid matter to a certain micron rating. Water (for example) is not a solid and will pass straight through such a filter.
Even if you have an aftermarket fuel filter and water separator with a sight glass (which would show you water passing through to your engine either separated as droplets or in a milky-looking fuel-water emulsion), they are only able to remove the water droplets. Once fuel emulsifies with water, filters and separators cannot distinguish between the two.
The benefits of Fuel Doctor include:
- Dispersing water and fungal material from dirty/contaminated fuel
- Lubricating microscopic solid matter that escapes the fuel filter, to allow them to pass through the fuel system safely
- Lubricating the entire fuel system and reducing engine component wear
- Cleaning and preventing gum, varnish, carbon deposits, and other particulate build up in fuel lines, carburettors, injectors, and valve faces
- Minimising exhaust gas recirculation soot deposits
- Maintaining fuel quality
- Providing optimised combustion
Lubricity is the measure of how much a lubricant reduces friction and/or wear and tear on components of, in this case, your engine and fuel system. When lubricity is too low, the components rub together with more force (friction) causing increased wear and damage, resulting in premature parts replacement and higher services costs.
As fuel pressures, running temperature, and performance of engines has increased, so has the need for higher lubricity to ensure that all the required components operate at full efficiency.
Adding the recommended amount of Fuel Doctor to your fuel will ensure you have a high level of lubricity in your fuel system which can extend the life of those components.
When considering the cost of replacement injectors, fuel pumps, and other components, Fuel Doctor is very good value for money as it can prevent damage to these components and extend their service life. When compared to other fuel additives, not only does it treat dirty fuel better, but at recommended treatment rates, Fuel Doctor has been the most cost-effective product in its class for many years.
Established in 1994, and 100% Australian owned and operated, Fuel Doctors™ specialise in cleaning fuel tanks. Many of the commercial underground storage tanks they were contracted to clean, had no physical access points, so they needed to develop a new method of tank cleaning.
This led to the creation of the Fuel Doctor Fuel Conditioner, the industry leading product which has been used in emergency generators, service stations, marinas, agricultural machinery, and all manner of vehicles for more than twenty-five years and has sold more than 1 million litres worldwide.
Researched, developed, tested, and used on a daily basis all in-house by the Fuel Doctors™ makes the Fuel Doctor Fuel Conditioner product unique in the industry and allows them to guarantee that, when used as directed, Fuel Doctor will do no harm to your engine or fuel systems.
Every time you fill up, you take the risk of dirty fuel causing damage to your fuel system. Each tank of fuel you buy could contain enough water to flood your common rail direct injection system, as it only takes around 30ml. Yes as little as a shot glass! Yes as little as a shot glass! That top up on the way home from the shops could have just enough water and contaminants in it to completely ruin your engine.
When comparing the price of Fuel Doctor to the replacement cost of fuel pumps and injectors, Fuel Doctor becomes essential in quality assuring every litre of fuel you buy.
Every tank of fuel is potentially adding to the existing gunge and muck in the bottom of your fuel tank and increasing the level of contamination in the fuel passing through your engine.
The best time to buy Fuel Doctor is yesterday. The next best time is now.
The sooner you treat and maintain your fuel tank and system with Fuel Doctor, the sooner you can prevent further damage from dirty fuel and fill your tank with the confidence of knowing you’re protected.
For all our retail sizes of Fuel Doctor, standard shipping anywhere in Australia is included in the price, so it costs you nothing extra.
If you need your Fuel Doctor quicker, we do have an express shipping option at checkout. It’s only an extra $4.00 per item, even if the item is a package deal.
For your security we also offer an Express + Signature service which costs $7.50 per item, even if the item is a package deal.
Please note: unfortunately we are unable to offer the signature service on standard delivery.
For all our retail sizes of Fuel Doctor, we ship via Australia Post. For estimated standard shipping delivery times please see the table below.
Australia Post Standard Parcel – Shipping Australia Wide for our retail bottle sizes (250ml, 1 litre & 5 litre) and package deals containing these bottle sizes is included in the price so you don’t have to worry about paying for anything extra. For estimated delivery times please see the table below.
Australia Post Express Parcel – Simply choose the express shipping option at check out and the shipping calculator will add $4.00 per item for the express post option. Each package deal counts as a single item regardless of how many individual products are in each package deal. Signature on delivery is also available for Express Post at an additional $3.50 per item.
Consumer Guarantees and Your Rights Under the Australian Consumer Law
Under the Australian Consumer Law, you have guaranteed legal rights for goods and services you purchase. These are called consumer guarantees.
All goods sold in Australia come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
There are nine consumer guarantees that apply to goods you purchase:
- Acceptable quality
- Match description
- Express warranties will be honoured
- Fit for a particular purpose
- Match the sample or demonstration model
- Title to the goods
- Undisturbed possession of the goods
- No undisclosed securities on the goods
- Spare parts and repair facilities will be available for a reasonable time after purchase
Consumer guarantees cannot be excluded and are in addition to any extended warranty you purchase or any voluntary warranty (warranty against defects) you are given. However there may be circumstances where you are not entitled to a remedy. Please read our terms and conditions and for further information about the Australian Consumer Law and consumer guarantees, visit www.consumerlaw.gov.au.
You can request the cancellation and refund of an order for any reason at any time prior to the order being packaged for delivery. Unfortunately, once the order is packaged, it cannot be cancelled and will be considered a return.
Due to these time constraints, it is recommended to make any cancellation enquiries over the phone on +61 491 626 016 during business hours, as we cannot guarantee that any other form of communication will be received prior to the order being packaged.
Please see our terms and conditions for further details.
Please choose carefully as returns where you have changed your mind, made a wrong selection, requested order cancellation after the order has been packaged or shipped, or simply found the goods cheaper elsewhere, are only provided at our sole discretion and will be subject to a 30% restocking fee (calculated on the order total including shipping costs). We recommend you carefully preview any items before adding them to your shopping cart and proceeding with your order.
Please see our terms and conditions for further details.
If any items in your order arrive damaged or are faulty, please fill in our returns request form with all relevant details of the order, delivery issue, and photographic proof. Do not return the items without prior approval as any such returns will not be accepted.
Please see our terms and conditions or call us for further details.
When refunds are approved, they will be processed as soon as possible and via the payment method used to complete your order, if that method is still available to us. If that method is no longer available, alternative arrangements will be made.
Please see our terms and conditions for further details.
The Best Protection Available Today!
Order your Fuel Doctor today to protect your engine and fuel system as soon as possible.
Use it in every fill up and safeguard your car against water and fungal contamination!