Fuel-injection system for motor-vehicle engine

Details Fuel-injection system for motor-vehicle engine Fuel-injection system for motor-vehicle engine

1994-12-16

1996-03-26

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

123514, F02M 3704

Patent

active

055011969

ABSTRACT:
A motor-vehicle engine system has an internal-combustion four-cycle engine having a fuel-supply manifold and operable at variable speed with a fuel requirement dependent on speed, a substantially closed but vented fuel tank holding a supply of gasoline, a fuel pump having an input connected to the tank and an output, and a fuel-feed line connected between the fuel-pump output and the fuel-supply manifold. A controller connected to the engine and to the pump operates the fuel pump at a throughput rate equal to between 5% and 40%, preferably 10% to 30%, more than the instantaneous fuel requirements of the engine. A return line connected to the fuel tank is provided with an overpressure valve that opens and returns to the tank fuel in the manifold that is in excess of the engine's instantaneous requirements and thereby maintains a predetermined constant pressure in the fuel-supply manifold.

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