Installed in Under 2 Minutes
No mechanic. No tools. No engine modifications. FuelMarble drops directly into your coolant reservoir and starts working immediately.
Buy FuelMarbleBefore You Install — Read This First
- Engine must be OFF. Remove the key from the ignition before opening anything.
- Engine must be COOL. Never open a pressurised coolant cap on a hot engine. Wait at least 30–60 minutes after driving.
- Coolant reservoir only — never the fuel tank. FuelMarble is placed in the coolant reservoir. Do not place it in the fuel tank, oil filler, or any other opening.
3 Steps to Install FuelMarble
The entire process takes under 2 minutes. No specialist knowledge required.
Locate the Coolant Reservoir
Open the bonnet after the engine has fully cooled. Find the coolant reservoir — usually a white or translucent plastic container filled with coloured coolant (pink, green, or yellow). Check that the coolant level sits between the minimum and maximum lines.
Insert FuelMarble
Unscrew the reservoir cap and drop the entire FuelMarble device inside so it sits fully submerged in coolant. The device works by enhancing the thermal stability of your coolant, which promotes more complete fuel combustion on every journey.
Close and Drive
Tighten the cap securely, close the bonnet, and drive as normal. FuelMarble works continuously as you drive — no break-in period, no monitoring required. Full effect is typically observed within the first full tank of fuel.
Complete Installation Overview
A full visual walkthrough of the FuelMarble installation process.
FuelMarble S or L — Which Do I Need?
FuelMarble S — £239
For personal cars, delivery vans, SUVs, MPVs, and motorcycles — any petrol or diesel vehicle under 2 tons with a coolant reservoir.
View FuelMarble SFuelMarble L — £519
For haulage trucks, large delivery vans, and heavy diesel commercial vehicles over 2 tons.
- Under 2 tons: 1 unit of FuelMarble S
- 2–4 tons: 1 unit of FuelMarble L
- 4–13 tons: 2 units of FuelMarble L
- 13 tons or above: 3 units of FuelMarble L
Not sure? Contact our team and we'll advise the right fit for your vehicle.
Ready to Install?
Order your FuelMarble today and you could be saving fuel by tomorrow.