Inertia Fuel Shutoff Switch: Description and Operation

Fuel Pump Relay and Inertia Switch

Inertia Fuel Shutoff Switch

Inertia Switch Location:

An inertia switch is installed in the B+ line to the relay between the fuse and the fuel pump relay. In the event of an impact greater than 14G the switch will open interrupting power to the relay.
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The inertia switch is located under the hood on the right hand side of the bulkhead (view from front bumper).


Fuel Pump Relay and Inertia Switch

Fuel Pump Relay:

Functionnaire Description
The Fuel Pump Relay is a normally open contact relay used to control the fuel pump. The pump is initially energized when the ignition is switched on to position 2. It will remain energized for a set time to pressurize the fuel system. The fuel pump relay will remain energized if the engine running flag is detected otherwise it will be switched off after the time delay has elapsed. The relay is switched to off immediately if the engine stop flag is detected and is switched off after a time delay if the ignition key off is detected. The relay gets its B+ feed from the ignition switch through fuse 20 and is energized when the EMS2000 provides a ground on pin 105.