Cold start fuel control system

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers arranged in at least two spaced apart and parallel banks, a source of fuel and a primary intake manifold having an air inlet and a plurality of outlet ports with one outlet port being fluidly connected to each combustion chamber, said system comprising:

• a cold start fuel assembly having an inlet and an outlet,
• said cold start fuel assembly inlet being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected through a branch pipe to each combustion chamber at a position downstream from the inlet of the primary intake manifold,
• a control orifice member selected to deliver a predetermined fuel flow fluidly connected in series between said branch pipe of said auxiliary intake manifold and each of said combustion chambers.

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers arranged in at least two spaced apart and parallel banks, a source of fuel and a primary intake manifold having an air inlet and a plurality of outlet ports with one outlet port being fluidly connected to each combustion chamber, said system comprising:

• a first cold start fuel injector assembly having an inlet and an outlet,
• a first elongated auxiliary intake manifold having an internal chamber and secured to the engine so that said first auxiliary intake manifold extends along one bank of combustion chambers, said first auxiliary intake manifold chamber being fluidly connected to each combustion chamber in its associated bank at a position downstream from the inlet of the primary intake manifold,
• said outlet from said first cold start injector assembly being fluidly connected with said internal chamber of said first auxiliary intake manifold,
• said first cold start fuel injector assembly inlet being fluidly connected to the source of fuel,
• a second cold start fuel injector assembly having an inlet and an outlet,
• a second elongated auxiliary intake manifold having an internal chamber and secured to the engine so that said first auxiliary intake manifold extends along the other bank of combustion chambers, said second auxiliary intake manifold chamber being fluidly connected to each combustion chamber in its associated bank at a position downstream from the inlet of the primary intake manifold,
• said outlet from said second cold start injector assembly being fluidly connected with said internal chamber of said second auxiliary intake manifold,
• said first cold start fuel injector assembly inlet being fluidly connected to the source of fuel.

A cold start fuel control system for use with an internal combustion engine having at least one combustion chamber, a source of fuel, and a primary intake manifold having an air inlet and an outlet port connected to each of the at least one combustion chamber, said system comprising:

• a cold start fuel assembly having an inlet and an outlet,
• said cold start fuel assembly inlet being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected to the at least one combustion chamber at a position downstream from the inlet of the primary intake manifold,
• wherein said auxiliary intake manifold comprises an elongated tube having an inlet end fluidly connected to the outlet of said cold start fuel assembly, said tube being secured to the engine such that said tube slopes continuously downwardly from said inlet end of said tube and toward the primary intake manifold.