Carburetor of the diaphragm type having a priming device

Claim 1

In an engine carburetor of the diaphragm type including a mixing passage for supplying a fuel mixture to said engine, a diaphragm chamber through which fuel is supplied to said mixing passage during normal engine operation, and means including a fuel pump and a fuel passage for supplying fuel from a fuel tank to said diaphragm chamber, the combination comprising a fuel well for containing at least a quantity of fuel sufficient when combined with fuel from said fuel passage to effect engine startup, means including a fuel well supply passage branched from said fuel passage for maintaining communication between said fuel well and said fuel passage by operation of said fuel pump during normal engine operation, means including a starting fuel discharge passage and a starter valve for delivering fuel from said fuel well to said mixing passage during engine start-up said starter valve being operative to be shut when said engine achieves a predetermined normal operating level, and fuel well discharge means for continuously delivering fuel in excess of a predetermined level from said fuel well back to said fuel tank to prevent the supply of fuel in said fuel well from exceeding said predetermined level.