Carburetor by-pass

An air by-pass device for internal combustion engines comprising:

• a first valve assembly adapted to be sealingly mounted between a carburetor assembly and the engine intake manifold, said valve assembly including a housing having a passageway extending therethrough providing fluid communication between said carburetor and said manifold, and a valve member operable to move between open and and substantially closed positions in said passageway,
• means for conveying ambient air to said intake manifold through said first valve assembly,
• a second valve assembly operatively connected with said air conveying means for controlling the flow of air therein,
• first and second solenoids for operating respectively said first and second valve assemblies simultaneously,
• an electric line for connecting said first and second solenoids with a source of electric current,
• a normally closed manual switch in said electric line capable of interrupting the electric current,
• a switch member in said electric line and interconnected with the accelerator such that said switch is open when the accelerator pedal is depressed and closed when the accelerator pedal is released to idle position,
• a sail switch in said electric line and positioned in the flow of air from the engine cooling fan and adjusted so as to be closed when the air flow from the fan exceeds the normal flow at idle and open when the air flow equals the normal flow at idle,
• whereby when said accelerator pedal is released at a time when the air flow from the engine cooling fan exceeds normal flow at idle, said first and second solenoids will be energized for closing said first valve assembly and cutting off fuel flow to the engine and opening said second valve assembly for admitting ambient air to the engine.