Unknown to most automotive owners, in fuel-injected engines there is an inertial cut-off switch that shuts down the fuel pump when an impact is sensed. The reason is to prevent a fire from a ruptured fuel line. Thus, if a vehicle so equipped is involved in a minor bumper hit, the fuel-cut-off may be initiated and you aren't going anywhere. This often happens in a parking lot when someone gives your car a little bump while you are inside shopping. Interestingly, some police cars have this feature and the officers are not aware that if they bump a car during a pursuit their engine will shut down. I a disaster, during an evacuation, you might bump the bumper pushing a tree out of the way or another vehicle. "Poof!" Your vehicle then becomes totally inoperative until the switch is reset. Fiendishly, the reset button is in different places in different makes of cars. In many cases it is a red button in the jack storage compartment at the right rear tire in the trunk. In other cars it may be under the dash. If you have a fuel injected car, it behooves you to locate this button (ask your mechanic or consult your owner's manual) so you know how to reset it before you are stuck with the wife and kids in twenty below zero weather on a deserted highway because you hit a deer and activated the inertial cut-off.
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