1968-69 DATSUN Pickup Engine Modification: Operation: Notes

This system consists of four switches, the vacuum switch, transmission neutral switch, clutch switch, and the throttle valve switch. These four switches are connected in parallel in the circuit and control the position of the cut-off valve which is located in the idle circuit of the carburetor. Therefore, no current flows and the needle of the solenoid valve cuts off the fuel supply only when all four switches are off (which is on deceleration).