Abstract: A fuel-tank control valve includes: casing; main float; plate with upper surface that constitutes bottom portion of casing, and that includes first gas-storage chamber formed of plate and peripheral wall portion that is provided upright from rim of upper surface to lower side; sub float arranged above the plate; second gas-storage chamber formed of a part including gas supply hole of first gas-storage chamber among parts of upper surface, and partition-wall portion which is away from peripheral wall portion, and that is provided in first gas-storage chamber; and clearance which is formed between casing and peripheral wall portion, and through which fuel in fuel tank can flow in, second gas-storage chamber and clearance being provided for sub float. Upper surface includes protruding seating portion that forms inflow space through which gas through gas supply hole can flow in under state in which sub float is seated on protruding seating portion.

Abstract: A fuel filter comprises a case having a fuel inlet pipe, a cap having a fuel outlet pipe and a filter element, which is housed in the space defined between the case and the cap, the filter element being formed in zigzag and being of hollow cylindrical shape characterized in that both ends of the filter element are held by flexible elastic bodies which are disposed and compressed between the filter element and the case and between the filter element and the cap.

Abstract: A fuel evaporative emission control system prevents fuel evaporative emission from discharging the atmosphere from the port of a filler cap in a fuel tank when the filler cap is opened during supply of fuel in the fuel tank and prevents the fuel evaporative emission from entering into a canister. The control system comprises a fuel evaporative emission backflow valve disposed between the canister and the fuel tank, the fuel evaporative emission backflow valve being closable to communicate with the canister and the fuel tank, the fuel evaporative emission backflow valve coupled to an intake manifold and having a valve which permits communication from the fuel tank to the canister, a solenoid valve disposed between the intake manifold and the fuel evaporative emission backflow valve, the solenoid valve including a first point communicating with the fuel evaporative emission backflow valve, a second port communicating with the intake manifold and a third port communicating with the atmosphere.

Abstract: An apparatus of and a method for forming a multistage hollow pipe comprising the steps of arranging a hollow pipe on a plurality of molds composed of an upper mold, first, second, third forming molds for subjecting the hollow pipe to drawing process, axially applying a compressive force, which is greater than the force forming multistage bulges on the hollow pipe, to the hollow pipe for forming the multistage hollow pipe, removing the processed multistage hollow pipe and other molds from the first forming mold, releasing the clamping of the processed multistage hollow pipe by the second and the third forming molds, and taking out the processed multistage hollow pipe.

Abstract: An evapo-control valve, which is disposed in a pipe for connecting a fuel tank and a canister, comprises a fuel tank side connecting port which communicates with the fuel tank, a canister side connecting port which communicates with the canister, an intake manifold side connecting port which communicates with an intake manifold, a closing valve for permitting the canister side connecting port to communicate with the fuel tank side connecting port by the negative pressure in the intake manifold side connecting port during the operation of an engine, and a check valve for permitting the atmosphere in the canister to communicate with the fuel tank when the fuel tank is negatively pressurized due to cold weather during the stop of the engine.

Abstract: A first port is provided in a fuel tank of an automobile for introducing an open air therefrom when the liquid surface of fuel lowers in the fuel tank. There is provided a float in the fuel tank which is detached from a second port when the liquid surface is under a predetermined level in the fuel tank but closes the second port when the liquid surface exceeds the predetermined level for preventing the fuel from overflowing the first port. There are provided a diaphragm and a rod to be operated by the diaphragm inside the float for preventing the float being kept adhered to the second port by pushing back the diaphragm by the rod.

Abstract: A known fuel filter is formed by a meshed body in a bag shape made of a synthetic resin while the meshed body is penetrated to form a fuel passage which is open toward the inside of the meshed body. The known fuel filter is attached to a portion adjacent to a bottom of the fuel tank for preventing water and a dust accumulated inside the fuel tank from being drawn inside the fuel filter. However, the known fuel filter has the fuel passage penetrating the central portion of the meshed body so that the degree of freedom of attachment is reduced. On the other hand, a fuel filter according to the present invention comprises a piece of meshed body being folded double, an outer flange and an inner flange respectively having a fuel passage and being connected to each other from the inside and the outside of the doubled folded portion, a swollen supporter provided integrally with or separately from the inner flange.

Abstract: The present invention relates to a solenoid valve disposed over a fuel tank and incorporating a liquid surface detecting valve for detecting the liquid surface in a fuel tank. The solenoid valve comprises a plunger and an adhesion preventive pin wherein the adhesion preventive pin is lowered in the direction of the liquid surface detecting valve at the time of opening of the solenoid valve and the same pin pushes the liquid surface detecting valve downward at the time when the liquid surface detecting valve is attached and adhered to a valve seat thereof, whereby the liquid surface detecting valve is open with assurance.

Abstract: A check valve comprises a frustoconical projection extending upwardly from a bottom surface of the valve body within a valve chamber and an elastic member provided with a plurality of elastic pieces extending downwardly from the valve for sliding on an outer surface of the frustoconical projection in the manner to bring into contact with the outer surface of the frustoconical projection, whereby the check valve characteristic is normally kept stable.

Abstract: A throttle valve control system of engine having an ultrasonic motor for driving a throttle valve fixed to a rotary shaft and positioned in a throttle body forming a suction passage. The throttle valve control system comprises a stator mounted on one side of the throttle body and provided with an elastic member having a plurality of piezoelectric elements and a travelling wave generator surface respectively disposed on the elastic member, and a rotor positioned at the outside of the stator and fixed to an extension of the rotary shaft whereby said rotor being rotatable by receiving the travelling wave generated by the travelling wave generator surface.

Abstract: A fuel filter unit having a fuel inlet chamber is threadedly mounted on a fuel pump for easy detachment therefrom. A tubular holder is fixed to the fuel pump for receiving fuel flowing out of the fuel filter unit when the latter is replaced. The fuel filter unit has a drain groove for collecting foreign matter trapped in fuel, so that any collected foreign matter will be discarded along with the fuel filter unit at the time of replacing the same. The fuel pump and the fuel filter unit are in fluid communication through an arrangement which includes a connector disposed in the fuel pump, and a fuel inlet pipe is connected to the connector through a side wall of the fuel pump. Therefore, it is not necessary to detach the fuel inlet pipe when the fuel filter unit is replaced.

Abstract: A diaphragm-type fuel pump defining therein an outlet chamber for supplying fuel to a carburetor. A return pipe is connected to the interior of the outlet chamber to permit return of vapors to the fuel tank. An outlet pipe communicates with the outlet chamber for supplying fuel to the carburetor float chamber. The fuel pump has an outlet valve associated therewith for supplying fuel into the outlet chamber. The open inlet end of the return pipe communicates with the outlet chamber at an elevation which is higher than the elevation of the outlet valve, and the inlet opening of the outlet pipe communicates with the outlet chamber at an elevation which is lower than the elevation of the outlet valve, whereby vapors within the outlet chamber are prevented from passing through the outlet pipe to the carburetor.

Abstract: A fuel pump comprises an outer casing, which is made by drawing a steel sheet, caulkedly fitted to a diecast lower body. The outer casing is constricted in three stages. The second stage contains a seal-receiving flange at the open-side end of a cup-shaped inlet chamber shell, so that the inlet chamber shell contacts the inside surface of the outer casing. Also, the inlet chamber shell is brazed to the inside of the top of the outer casing for the purpose of rust prevention. Ribs are projected on the top of the outer casing to decrease its vibration and noise.