Abstract: The disclosure embraces a fuel system and charge forming apparatus of the float bowl type including a heat exchanger or heat transfer means associated with the charge forming apparatus providing a fuel circulating system or circuit for conveying heat away from the fuel in the charge forming apparatus to maintain the fuel below temperatures at which the fuel readily vaporizes to prevent or minimize "vapor lock" in the fuel bowl and fuel channels of the charge forming apparatus.

Abstract: The disclosure embraces a charge forming apparatus or carburetor and method of operation thereof wherein the charge forming apparatus is of modular construction and is inclusive of a body construction and a fluid flow control construction associated with the body construction, the fluid flow control construction being of laminar character fashioned with open areas or passages accommodating fluid flow or transfer, the fluid flow control being of a character enabling the interchangeability of fluid flow control laminations having different or modified patterns or arrangements of open areas or passages whereby the method of operation or the operating or metering characteristics of the charge forming apparatus may be changed or modified without alteration of the body construction.