Introducing the eVAP Firefly, the flagship product of the eVAP range. It has been specifically designed for vehicles with larger engines - especially turbo charged vehicles - 4x4s and smaller commercial vehicles.

Features: precision engineered heater 3 independent heating elements total peak power available 700W normal running power under 250W internal thermistor sensor solid state digital electronic controller user selectable fuel temperature¹ LED temperature display automatic overheat cut-out fuse protected

Suitability: The eVAP Firefly has been designed for installation as a fuel pre-heater in diesel engined cars up to around 3 litres, including direct and indirect injection and turbo-charged engines. It has not yet been tested with common rail injection and is not recommended for these at this stage. Correctly installed it will allow the use of waste vegetable oil (WVO), standard vegetable oil (SVO), biodiesel and fossil diesel in almost any combination³.

In single tank installations, the eVAP Firefly begins heating the fuel as soon as the ignition is turned on, before even turning the starter motor.  It supplies hot fuel into the injector pump in a matter of seconds² after starting, building steadily towards the user selected temperature¹.  Once the fuel is at the correct temperature, the eVAP Firefly will reduce power consumption on the heating elements and then disengage one or two heating elements to maintain a constant output, even under heavy acceleration. As the return fuel heats the cold fuel in the tank, power consumption reduces still further.

This is the simplest of all conversions to install and operate; simply pour your chosen fuel into the tank and drive. No switches, valves, controls, extra tanks, diesel³ or purging. Just fill the tank, start the engine and drive. 

In twin-tank installations, the eVAP Firefly begins by heating the diesel in the fuel system, which passes on its heat to the fuel filter and injector pump. In as little as a minute or so, the driver can choose to switch over to the main tank, containing 100% SVO or WVO. This eliminates much of the normal 5 to 15 minutes warm up time of the engine before being able to switch tanks.

Fitting the eVAP Firefly can also dramatically reduce purging.  If the car is to stop for only a short while, maybe a few hours, then the residual heat in the engine and fuel, together with the instant power of the eVAP Firefly, can permit restarting on the main tank alone.  For longer stops, particularly on warm summer days, and for those wanting maximum savings, drivers may choose a shorter purge and restart on a diesel/WVO mix.

eVAP Firefly in twin tank installations can be used in addition to, or in place of, the coolant heat exchanger, and is ideally suited for: those who prefer the security of starting on diesel; those who make shorter journeys; those who would like to switch to the main tank very much quicker; those who would like much shorter, or fewer, purges; and those would like to reduce the amount of diesel they use, so helping them enjoy even greater savings and lower emissions.

The digital controller monitors the temperature of the fuel inside the heater and regulates the power output of the heating elements.

Close up detail showing the easily accessible heating elements.

¹ The eVAP Firefly heater is precision engineered to operate between 40°C and 70°C, being the normal temperature range achieved by most coolant heat exchangers.  Electronic thermostatic control of the set point allows the user to specify an exact temperature between these figures to obtain the very best performance, economy and reliability for any particular car.  Users can select temperatures outside this range, but setting the temperature above 85°C is definitely not recommended as fuel hose is normally designed to operate at a maximum of 85°C.

² The temperature of the fuel entering the injector pump is partly dependent on the location of the eVAP Firefly in the fuel system.  Ideally it should be installed immediately before the fuel filter.  Installing it a long distance from the injector pump will result in higher heat loses giving a lower fuel temperature and a longer warm up time.

³ Many people will choose to operate a single tank system using 100% WVO.  To ease starting, particularly in the winter, most people will prefer to add 10% diesel to each tankful, all year round, increasing to maybe 25% to act as an anti-freeze in colder winters.