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Fuel Catalyst

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This Information Sheet has been prepared to provide an overview of Broquet, its applications and benefits.

Briefly, Broquet is a metallic catalyst that reacts with fuel resulting in an improved combustion process, reductions in carbon emissions and an improvement in fuel consumption (typically 8 - 10%). It is equally effective with petrol and diesel engines. It can be used on cars, trucks, buses, marine engines and static plant such as generating sets and oil-fired boilers. The catalyst is simply placed into the fuel tank or held in a cartridge that is connected into the fuel line. As well as providing a cleaner combustion process the catalyst will also have the effect of removing carbon and gum deposits in the combustion chamber and inhibiting the build up of further deposits; this means reduced engine maintenance. For cars and smaller engines a single installation would be expected to outlast the life of the engine. For trucks it is suggested that the catalyst pellets are replaced every 250,000 miles or every 6,500 operating hours in a marine environment. The initial cost of the unit is soon recovered in fuel savings. For a car these savings can amount to several hundred pounds over the life of the engine and several thousand pounds for a larger truck engine.

The photograph shows the basic catalyst pellets, the in-tank unit (on the right) and a selection of in-line units.

broquet summary


The technology has its origins in WW2 when it was first conceived as a means of improving the quality and stability of poor grade locally produced Russian fuel that was needed to power British Hurricane aircraft operating on the Russian front. The late Henry Broquet was a young RAF technician who was in a specialist RAF support unit that was sent out to Russia in 1941 with the first of around 3,000 Hurricanes that were sent from Britain. After the war Henry Broquet developed the technology where it was used primarily in large marine diesel engines as a maintenance tool to prevent the build up of carbon deposits and keep lubrication oil cleaner. The product re-emerged in the mid-eighties in the UK as an alternative method of "converting" engines that were designed for leaded petrol to run well and safely on unleaded fuel. In the decade that followed around 150,000 vehicles adopted this leaded/unleaded "conversion" and have collectively covered several billion miles running without problems on unleaded fuel. In today's market, where most cars are designed for unleaded fuel, the catalyst is seen as a way of reducing fuel costs and lowering carbon emissions. A significant market is its use in performance engines that prefer a high octane fuel as Broquet will enable them to run as well, without loss of performance, on a lower octane unleaded fuel.

Note on environmental benefits:

We are conscious of not trying to jump on the "green bandwagon" Nonetheless there is no doubt that use of Broquet has a significant contribution to make to a cleaner environment and reduction of carbon emissions. Furthermore Broquet has enabled tens of thousands of petrol vehicles to switch from leaded to unleaded petrol. In modern vehicles fitted with catalytic converters it should be noted that Broquet works all the time whereas a catalytic converter will not be effective for some time until the exhaust is hot. In addition better combustion means an overall improvement in fuel consumption and a reduction in actual weight (grams per kilometre) of carbon emissions. For diesel engines Broquet will significantly reduce smoke output including tiny particulate emissions that are especially damaging to health. Resultant fuel savings will soon recover the initial cost of the product.

In summary, the Broquet benefits include:

  • Reduction in fuel consumption - improved mpg
  • Reductions in exhaust emissions (for both petrol and diesel engines)
  • Increased engine power
  • Reduction of tendency to "pink" (detonation) in performance engines
  • Guaranteed conversion of leaded petrol engines to unleaded petrol
  • Cleaner combustion chambers and components
  • Less maintenance
  • More responsive engines

Applications include:

Motorcycles - Automobiles - Trucks - Buses - Boats and other craft such as Jet Skis - Generators - Oil-fired boilers - Agricultural vehicles and off-road plant

Boat Applications:

We are marketing two applications.

1. The in- tank for applications with a single or more than one take off i.e. engine and diesel heater. Here the Broquet Catalyst pellets are supplied wrapped in mild steel gauze to be placed into the fuel tank (ideally suspended from your fuel filler chain). The in-tank version is 5" long x 1" dia.

2. The in line, for applications with one take off i.e. engine. The Broquet Catalyst is contained in a steel cartridge for installation into the fuel line. The in-line unit is 6" long x 1 1/4" dia, excluding end fittings. The end fittings can be specified to suit your installation, hose to hose or a compression fitting for copper fuel lines.

But don't just take our word for it....

Dear Spencer,

I have recently bought a 3 year old narrow boat fitted with a Barrus 45 engine with just 600 hours use. The engine smoked a little (as is normal for this particular make) and proved to be a little uncomfortable in locks when the exhaust outlet was against the lock wall. As I have had previous experience with the Broquet catalyst –and has proven to be everything the manufacturers have claimed of it – I decided to fit one to the fuel tank of the boat. I have now done about 250 hours and I can honestly say that the smoking has reduced dramatically (almost to nothing at all when the engine is warm) Although never noisy, the engine is also detectably quieter. The Mikuni heater glow plug now remains clean and the flame detector, which required regular cleaning is always clean when checked.

A local narrow boat engineer – a Barrus “fan” – has recently expressed great surprise that I have a Barrus engine installed at all!

I am totally convinced that the Broquet catalyst improves the burn quality of any fuel with all it’s consequent beneifits. The boat is about to embark upon a complete cruise of the canal system and I am looking forward to Broquet helping us along the way.

Narrow boat “Spirit”

Product Costs & How to Order:

OptionDetailsPriceBuy Now
Including postage to a UK address
A The cost of in-tank unit (10 Pellets for tanks up to 20 Gallons) £99.00 Inc VAT
B The In line with standard hose to hose fittings for engines up to 60bhp £88.00 Inc VAT
C The in line with compression fittings for engines up to 60 bhp £94.25 Inc VAT

Payment Method

Click on "Buy Now" or send a Cheque payable to "The Boatyard" 5 Hammond Way, Trowbridge, Wiltshire, BA14 8RS. Your order will be dispatched by Return. A fitting service is avalible please phone for details.


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