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...when doesn't.
Electrical troubleshooting
Although electric fuel pumps themselves are easy to understand, the circuits that control them are a little more complex. All pumps have a fuse in the circuit, but more control is needed than just overload protection. This is especially important when controlling a highly flammable liquid--like gasoline.
Most pumps are powered during cranking and will continue to run after the engine starts. If the ignition is turned on without starting the engine, the pump only runs for a second or two. This safety measure prevents fuel from being pumped into the engine...
NOTE: All illustrations and photos
have been removed from this article.
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