Internally vented float bowl primer arrangement

Details Internally vented float bowl primer arrangement Internally vented float bowl primer arrangement

1980-09-24

1982-04-06

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Liquid supply tank

261DIG8, 261DIG67, F02M 116

Patent

active

043235220

ABSTRACT:
A manually actuable primer for an internally vented float regulated fuel bowl type carburetor employs an arrangement for minimizing variations in fuel mixture richness resulting from variations in air intake path restrictions as might be created by a clogged air filter includes a bifurcated float bowl air vent conduit with one branch communicating with the carburetor bore in the region of the Venturi and the other branch communicating with the bore outside the region of the Venturi along with an arrangement for directing displaced fuel from the fuel supply chamber directly into a conduit which normally conveys fuel from a fuel well to the Venturi region, the directing arrangement being formed as an annular insert for the fuel well, the aperture of which forms the fixed fuel metering orifice of the carburetor. With this arrangement primer actuation pressurizes the region above the fuel in the float bowl, forcing fuel through the annular member directly into the nozzle communicating between the fuel well and the carburetor bore Venturi, while the bifurcated float bowl air vent arrangement allows a smaller vent opening into the float bowl, making float bowl pressurization priming feasible, while minimizing mixture richness changes normally associated with air intake obstructions such as a dirty air filter.

REFERENCES:
patent: 1752959 (1930-04-01), Monier
patent: 3001774 (1961-09-01), Sarto
patent: 3231250 (1966-01-01), Kalert, Jr.
patent: 3345045 (1967-10-01), Tuggle
patent: 3780996 (1973-12-01), Nutten
patent: 3968189 (1976-07-01), Bier
patent: 4203405 (1980-05-01), Schultz et al.
Tecumseh Products Co. Mechanics Handbook, pp. 2-2-6; 2-3-4; and 2-4-1 through 2-4-3, 12/76.
"Lawn-Boy" Carburetor, as per sketch submitted Nov. 28, 1980 by Applicant.

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