1979 Pickups

This switch is made up of two diaphragms, a micro switch, and an altitude compensation bellows. When manifold vacuum rises above the preset level, it overcomes spring tension and actuates a diaphragm. This, in turn, actuates the control valve and transmits vacuum pressure to the vacuum chamber. When vacuum reaches the chamber, the other diaphragm activates to operate the micro-switch, thereby operating the anti-dieseling solenoid valve.

Fig 1: 1979 210 Fuel Shut-Off System Schematic

Courtesy of NISSAN NORTH AMERICA, INC.

Fig 2: 1979 Pickup Fuel Shut-Off System Schematic

Courtesy of NISSAN NORTH AMERICA, INC.