Fuel supply system

Claim 1

IN COMBINATION WITH A SPACE HEATER INCLUDING A BURNER HEAD HAVING A SIPHON NOZZLE, A FUEL STORAGE TANK, A DELIVERY LINE FROM SAID TANK TO SAID NOZZLE, SAID TANK HAVING A DELIVERLY OPENING IN THE UPPER PART THEREOF, SAID DELIVERY LINE BEING ARRANGED IN ABSENCE OF SUCTION TO DRAIN FUEL FROM SAID NOZZLE BACK TO SAID TANK, A VERTICAL TUBE DEPENDENT WITHIN SAID TANK FROM SAID DELIVERY OPENING AND EXTENDING TO NEAR THE BOTTOM OF SAID TANK, THE LOWER END OF SAID TUBE BEING NORMALLY BELOW THE FUEL LEVEL IN SAID TANK, THE OPPOSITE ENDS OF SAID TUBE BEING OPEN, AND A FILTER INSTALLED IN THE UPPER PART OF SAID TUBE HAVING A CAVITY IN FREE AND OPEN COMMUNICATION WITH SAID DELIVERY LINE THROUGH SAID DELIVRY OPENING AND DEFINING A CHAMBER THEREBELOW AND MEANS FOR CREATING A SUCTION IN SAID DELIVERY LINE TO DRAW FUEL FROM SAID TANK THORUGH SAID TUBE AND SAID DELIVERY LINE TO SAID NOZZLE, DISCONTINUANCE OF SAID MEANS ALLOWING FUEL IN SAID DELIVERY LINE AND AT SAID NOZZLE TO DROP BACK INTO SAID TANK TO AND THROUGH SAID FILTER WITH RESLULTANT PURGING EFFECT, SAID FILTER BEING A CYLINDRICAL ELEMENT HAVING A HEAD END INTERENGAGED WITH THE UPPER END OF SAID TUBE AND BODY PORTION EXTENDING INTO SAID TANK IN SPACED CONCENTRIC RELATION TO SAID TUBE, SAID FILTER ELEMENT TERMINATING AT ITS END OPPOSITE SAID HEAD END WITHIN THE TUBE A SUBSTANTIAL DISTANCE FROM THE LOWER END THEREOF TO DEFINE WITH THE TUBE BENEATH THE SAID OPPOSITE END OF SAID FILTER ELEMENT AN OPEN SPACE OF SUBSTANTIAL VOLUME, SAID CAVITY BEING IN SAID BODY PORTION AND OPENING THROUGH SAID HEAD END.