Dual fuel supply system
The dual fuel supply system for an internal combustion engine has a carburetor including a fuel/air induction passage having means defining a low pressure zone and a secondary orifice and further including a cavity communicating with the fuel induction passage through the secondary orifice. A first or primary fuel supply includes a first float bowl connected to a source of a primary fuel, such as kerosene, a first float controlled valve operable to control the supply of the primary fuel to the first float bowl, a fuel nozzle for supplying the primary fuel from the first float bowl to the low pressure zone, and a conduit connecting the first float bowl in communication with the carburetor cavity. The second or secondary fuel supply includes a second float bowl communicable with the carburetor cavity and connected to a source of a second or secondary fuel, such as gasoline, and a second float controlled valve operable to control the supply of the secondary fuel to the second float bowl. In one embodiment, the carburetor includes a throttle valve located downstream of the low pressure zone and a priming fuel port located downstream of the throttle valve. A primer pump having an inlet connected in communication with the priming fuel port can be operated to selectively introduce a quantity of the secondary fuel into the induction passage to facilitate engine starting.
- Assignee:
- Outboard Marine Corporation
- Patent Number(s):
- US 4499887
- OSTI ID:
- 5627367
- Country of Publication:
- United States
- Language:
- English
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