- Connect a fuel line heater element in-line with the primary fuel intake on the engine by splicing the heater into a straight section of the fuel line or hose. Vegetable oil must be heated prior to entering the intake manifold to reach the desired viscosity, and in some very hot environments may not be required. These line heaters can be purchased in "Veggie" kits. The primary power wire should be run through an ignition switch, so that the battery will not drain while the car is turned off.
- Install a heating element onto the vegetable oil tank of the vehicle by coiling the element around the tank body to reach a temperature range of 150 degrees to 190 degrees. Some installations use a secondary fuel tank mounted onto the vehicle and a secondary fuel line with a solenoid switch, so that the fuel can be switched from diesel to veggie oil. Heating the tank is necessary in milder climates, as the oil will solidify in cold weather.
- Replace the glow plugs with a hotter style if veggie oil is to be used exclusively. Running the vehicle on both diesel and veggie oil will not require the hotter glow plugs, as the petrol-based fuel is used to start and stop the car. Using diesel for startup and shutdown will reduce the amount of "coking" that occurs when the veggie oil is left to cool on the internal intake components of the motor.
- Disconnect the fuel injection system and replace the injector modules with a larger units, if vegetable oil is used in the motor exclusively. The problem of the naturally lower-viscosity oil coking to the injectors is well known, and many German manufacturers are selling their kits with the over-sized injectors.
