What shuts off fuel system when in wreck
This truck uses a high pressure fuel system, key must be on for the electric fuel pump, which is in the tank, to work. Fuel pump senses when pressure drops, so that it will shut off if there is full pressure, and engine not running. If there is lower pressure, such as a broken line, it will continue to pump, if the engine is running. If you're asking if it has a safety feature shutting it off in an accident, no it does not, except if the engine shuts off due to the accident, fuel pump will not work, unless key is turned off and then back on, and will then work for about 5 seconds and shut off, unless engine is started. If you're asking why the fuel pump doesn't work after an accident, it's most likely damaged, or a wire has been damaged, OR the computer maybe damaged (therefore telling it to turn on/off when key is on and engine running with key on and pressure is low, or at the right level to run the engine. Again, if you turn the key on and do not start the engine, fuel pump will work briefly for about 5 seconds to bring pressure up to where it can be started, then the fuel pump will work again when the engine is started (so the fuel pump isn't running with the engine off for very long.)
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