Abstract: A method and apparatus for modifying an existing style fuel tank to add a fuel pump and a baffle assembly in the tank comprises removing an existing fuel sending unit from a sending unit opening and cutting an access hole in the top of the tank. Fuel supply and return lines, and electrical connections for the fuel pump are routed through a replacement cap for covering the sending unit opening and not up through the hole created for insertion of the pump and baffle assembly. The baffle assembly includes a cup for holding fuel around and over the fuel pickup connected to the fuel pump. The cup may be formed from a compressible material to allow it to be compressed before insertion into the tank through the access opening or it may be assembled inside of the tank from segments inserted through the access opening.

Abstract: A siphoning assembly for a fuel supply system comprises an adaptor body with a pressurized fuel inlet, a suction inlet and an outlet and an outlet passageway connecting the pressurized fuel inlet and the suction inlet to the outlet. A venturi nozzle extends in-line with the pressurized fuel inlet and opens into a suction chamber to create a pressure drop for pulling in fuel from the suction inlet which also opens into the suction chamber. The outlet passageway forming a liquid trap between the suction chamber and the outlet. The siphoning assembly may include a pressure relief valve connected to the pressurized fuel inlet formed as a bypass line of the pressurized fuel supply line. The siphoning assembly may be used in conjunction with an apparatus for modifying a fuel tank to add a fuel pump and baffle assembly which may include one-way check valves.

Abstract: A baffle for use in a fuel tank has a sidewall and an interior space. The sidewall is formed of a flexible material so as to be radially compressible. The compressibility of the sidewall allows the baffle to be inserted through a hole which is smaller in diameter than the uncompressed diameter of the baffle. The baffle is preferably also longitudinally compressible so that it can be mounted in fuel tanks of varying depths.

Abstract: A baffle has a sidewall and an interior space sized to receive the in-tank pump. The sidewall is formed of a flexible material so as to be longitudinally compressible. The compressibility of the sidewall allows the baffle to be mounted in fuel tanks of varying depths. The baffle is used in a method for mounting an in-tank fuel pump in a fuel tank. The method includes the steps of cutting a hole in a top wall of the fuel tank, inserting the baffle into the tank through the hole, compressing the sidewall of the baffle so that the baffle extends between the top and bottom walls of the tank, installing the in-tank pump in the interior space of the baffle and installing a cover plate over the hole.

Abstract: A baffle for use in a fuel tank has a sidewall and an interior space. The sidewall is formed of a flexible material so as to be radially compressible. The compressibility of the sidewall allows the baffle to be inserted through a hole which is smaller in diameter than the uncompressed diameter of the baffle. The baffle is preferably also longitudinally compressible so that it can be mounted in fuel tanks of varying depths.

Abstract: A baffle has a sidewall and an interior space sized to receive the in-tank pump. The sidewall is formed of a flexible material so as to be longitudinally compressible. The compressibility of the sidewall allows the baffle to be mounted in fuel tanks of varying depths. The baffle is used in a method for mounting an in-tank fuel pump in a fuel tank. The method includes the steps of cutting a hole in a top wall of the fuel tank, inserting the baffle into the tank through the hole, compressing the sidewall of the baffle so that the baffle extends between the top and bottom walls of the tank, installing the in-tank pump in the interior space of the baffle and installing a cover plate over the hole.

Abstract: A baffle has a sidewall and an interior space sized to receive the in-tank pump. The sidewall is formed of a flexible material so as to be longitudinally compressible. The compressibility of the sidewall allows the baffle to be mounted in fuel tanks of varying depths. The baffle is used in a method for mounting an in-tank fuel pump in a fuel tank. The method includes the steps of cutting a hole in a top wall of the fuel tank, inserting the baffle into the tank through the hole, compressing the sidewall of the baffle so that the baffle extends between the top and bottom walls of the tank, installing the in-tank pump in the interior space of the baffle and installing a cover plate over the hole.

Abstract: A baffle has a sidewall and an interior space sized to receive the in-tank pump. The sidewall is formed of a flexible material so as to be longitudinally compressible. The compressibility of the sidewall allows the baffle to be mounted in fuel tanks of varying depths. The baffle is used in a method for mounting an in-tank fuel pump in a fuel tank. The method includes the steps of cutting a hole in a top wall of the fuel tank, inserting the baffle into the tank through the hole, compressing the sidewall of the baffle so that the baffle extends between the top and bottom walls of the tank, installing the in-tank pump in the interior space of the baffle and installing a cover plate over the hole.

Abstract: A fuel supply system including a filter removably securable within a filter housing mounted within a fuel tank and a pump removably securable within a pump housing mounted within the fuel tank and interconnected by a pipe. The filter housing includes an inner housing rotatably mounted within an outer housing. Alignable inlet openings and outlet passageways are formed in the inner and outer housings. A removable plug for closing an access opening to the inner housing includes lugs for engaging mating recesses in the inner housing such that rotation of the plug rotates the inner housing relative to the outer housing for rotating the inner housing between an aligned and misaligned orientation relative to the outer housing to control the flow of fluid through the filter housing.

Abstract: A carburetor fuel level management system includes a fuel level sensor mounted in the float bowl of the carburetor for monitoring actual fuel level and providing a signal indicative of the fuel level. The sensor may be used for data acquisition and/or to provide feedback to a controller which maintains fuel level at or near a preferred level by varying fuel flow rate into the float bowl in response to an indication from the sensor that the actual fuel level differs from the preferred fuel level. Fuel flow rate may be controlled by selectively bypassing a fuel pressure regulator in the carburetor inlet line or by varying voltage to an electric fuel pump, among other methods.