http://www.bp.com/retail/liveassets/bp_ ... n_Fuel.pdf
it prefers kerosene or automotive diesel fuel to petrol...Petrol is not a good food source; its composition is rarely suitable and lead when present, acts as a poison.
The key to fungal control is removal of water. The low points of tanks and pipework must be drained regularly.
If all water is removed one of the essential conditions is absent and fungi cannot grow.