Patent ID: 8910616

Claim:
An engine, comprising: a fuel tank; a well configured to hold fuel delivered from the fuel tank; an air intake; a combustion chamber; a passageway configured to channel air from the air intake to the combustion chamber, wherein the passageway comprises a surface at least partially defining a constricted section of the passageway, and wherein the surface is configured to be adjusted to change the area of the passageway through the constricted section; a nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section, whereby the constricted section of the passageway provides a relative low pressure in air passing through the passageway that draws fuel from the nozzle to the air; a vent configured to connect the well with outside air; and a variable restrictor configured to limit the connection provided by the vent between the well and outside air, wherein the degree of restriction provided by the variable restrictor is a function of the area of the constricted section of the passageway.