Patent ID: 7568474

Claim:
A method for operating a diesel engine with a fuel that comprises vegetable oils or recycled vegetable oils, wherein the fuel is withdrawn from a tank ( 10 ), filtered by means of fuel filters and injected into the cylinders through injection nozzles by means of an injection pump ( 22 ), and wherein excess fuel is returned, wherein the fuel is transferred from the tank ( 10 ) into a storage reservoir ( 18 ) by means of a forcing pump ( 12 ) that forces the fuel through fuel filters ( 14 , 16 ) in the form of pressure-resistant fiber filters, and in that the fuel is treated by means of ultrasound in the storage reservoir ( 18 ) before it is introduced into the injection pump ( 22 ), wherein the injection pump ( 22 ) withdraws fuel by suction from the storage reservoir ( 18 ) and excess fuel is returned into the storage reservoir ( 18 ).