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Wiring Diagram-Yamaha 4.3L

i would likely go to the third post on the oil pressure switch....assuming, from your picture, that the white wire feeds the fuel pump.

the oil pressure switch is a SPDT - the fuel pump wire goes to the common terminal, the starter lead (YEL/RED) goes to the NC terminal and the ignition (PUR) lead goes to the NO terminal....the starter cirsuit will turn on the fuel pump whenever the starter is engaged...once the engine builds oil pressure, the switch contacts toggle and the ignition circuit supplies current to the fuel pump. when the oil pressure subsides, the switch opens and the fuel pump stops...
 
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