Because of the use of the additive MTBE (Methyl Tertiary-Butyl Ether) as an anti-knock additive in lead-free fuels, steel and aluminium tanks in vehicles corrode from the inside. In order to remedy this in the long term, an inner coating is practically essential. Degreasing is the first step in the removal of the sediment. Empty the tank completely and remove it from the motorcycle or car. Please carefully store or safely dispose of any remaining fuel. Then rinse out the tank completely with water. Next add approximately an eggcup full of washing up liquid and fill the tank approximately half full of warm water. Shake and turn the tank so that sediments are loosedned, and finally fill it completely with warm water. After approximately 1-2 hours remove this fluid and take it to an approved disposal station. Then add the appropriate amount of FERTAN alkaline engine cleaner to the tank according to its size (approx. 240 ml for every 10 litres of tank capacity), shake and turn the tank so that all the remaining residue is loosened, and let this solution react again for approximately 1-2 hours. Then empty out the cleaner and catch it in a container. You can use this cleaner for other cleaning jobs – e.g. engine/gearbox and axle cleaning; if the engine cleaner contains large particles it may be cleaned by means of a (coffee) filter. Now wash the tank out very thoroughly with water using lukewarm water for the final rinse.
Now we have the option to remove the rust from the inside of the tank using FEDOX rust remover to get back to bare metal and then stablise the surface with FERTAN or get get straight on with converting the rust using FERTAN. Both methods produce excellent results with surface being smoother if you use FEDOX.
When carrying out all work of this nature wear rubber or protective gloves. In order to avoid damage to the fuel tank and possibly to the ceramic of the sink, always place it on a soft pad. Don’t allow the FERTAN products to run out onto pale stones, tiles, paving stones, etc., because it could market them. Keep FEDOX off painted surfaces and rinse thoroughly and immediately with water (not necessary if the tank is ultimately to be repainted) if spillage occurs.
If you are using FERTAN do not dry the tank. Into a damp tank put about 200ml of FERTAN rust converter for every 10 litres of tank capacity. Turn the tank, rotate it and invert it so that it becomes completely coated on the inside. While doing this take extra care that in the case of motorcycle tanks the internal frame, and/or baffles if applicable, become fully coated – then let the fluid run completely out into a clean container. Next allow the tank to cure for a minimum of 24 hours at a temperature of 20 deg C (maximum six month), to facilitate the complete reaction with the oxide. Then rinse the tank thoroughly with water and reintroduce the previously saved quantity of FERTAN rust converter, and then completely fill the tank with water. Once more allow the tank to cure for 12-24 hours and then empty it completely and rinse it very thoroughly with water until no more black particles are visible in the water. Clean the filler cap, petrol tap, etc. immediately with clean water. Clean off any possible spots which land on the painted surface immediately with water (no necessary if the tank is ultimately to be repainted). In this time-consuming and dirty way a complete and cost-effective derusting can be achieved without removing sound material. After it has been dried the tank will be fully rust-free.
In the case of other tanks and types of tanks, e.g. heating oil and ships’ tanks, etc., please ask for our free instruction manual.