Vacuum bleed and flow restrictor fitting for fuel injected engin

Details Vacuum bleed and flow restrictor fitting for fuel injected engin Vacuum bleed and flow restrictor fitting for fuel injected engin

1988-01-04

1989-08-15

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

123510, 123520, F02M 3900

Patent

active

048564834

ABSTRACT:
In a marine fuel system for a fuel injected internal combustion engine, a fitting (50) is provided in the vapor supply line (41). The fitting (50) has a first reduced diameter passage (57) providing a vacuum bleed orifice passage partially venting vacuum from the induction manifold (17) to atmosphere, to limit peak vacuum applied to the vapor separator (33) from the induction manifold (17). The fitting (50) has a second reduced diameter passage (56) providing a flow restrictor passage limiting the volume of flow of fuel vapor from the vapor separator (33) to the induction manifold (17). The fitting (50) limits fuel vapor supplied from the vapor separator (33) to the induction manifold (17) at peak vacuum from the induction manifold (17) during rapid engine deceleration to prevent an overly rich fuel air mixture in the induction manifold (17) otherwise causing rough idling or stalling. The fitting (50) also solves hot restart problems. Another modification is provided by a one-way check valve (60) permitting only one-way flow of fuel from the vapor separator (33) to the high pressure fuel injection pump (25).

REFERENCES:
patent: 1490581 (1924-04-01), Bell
patent: 2222274 (1970-11-01), Antonusen
patent: 3548796 (1970-12-01), Gastinne
patent: 3617034 (1971-11-01), Skinner
patent: 4043304 (1977-08-01), Stumpp
patent: 4205648 (1980-06-01), Graham
patent: 4475522 (1984-10-01), Oonaka
patent: 4590897 (1986-05-01), Hundertmark
patent: 4699109 (1987-10-01), Hensel

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