Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...
Patent
1996-08-19
1997-07-15
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel flow regulation between the pump and the charge-forming...
123509, F02M 3704
Patent
active
056473311
ABSTRACT:
An electric fuel pump is housed in an aluminum body module formed by two iso-pods open-end-to-open-end to provide a multi-cavity module housing of heat conductive material. The pump inlet faces downwardly in one of the cavities and a small clearance volume directly surrounds the pump casing which, in one embodiment, is filled with liquid fuel and in another with cooling water. Another module cavity forms a fuel sump at its lower end and a vapor separator chamber at its upper end. Fuel is supplied from a fuel tank at a low pressure (3-8 psi) up to a float operated inlet needle valve in the vapor separator/sump cavity and a fuel passage communicates the sump with the pump inlet casing. The fuel collects as a pump inlet reserve supply in the sump at atmospheric pressure, or slightly thereabove. Vapor separates from the fuel into the pump headspace and is vented via a suitable vapor pressure regulator. The module has a water jacket coolant passageway system sealed from the housing cavities and surrounding the pump cavity so that circulation of cooling water through the housing water jacket carries away heat transferred to the housing from the fuel and generated by operation of the fuel pump. In a marine application the fresh or sea water boat intake for the engine cooling water is connected in series with the module coolant passageway on the intake side of the engine cooling system. Alternatively or supplementally, the module can be forced air cooled and/or the coolant liquid recirculated through a suitable heat exchanger such as a vehicle radiator for reuse in module cooling. In operation, the module reduces pump vapor lock by cooling incoming fuel, separating vapor therefrom and reducing sump operating temperature.
REFERENCES:
patent: 4697995 (1987-10-01), Tuckey
patent: 5103793 (1992-04-01), Riese et al.
patent: 5257916 (1993-11-01), Tuckey
patent: 5309885 (1994-05-01), Rawlings et al.
patent: 5375578 (1994-12-01), Kato et al.
patent: 5389245 (1995-02-01), Jaeger et al.
Moulis Thomas N.
Walbro Corporation
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