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An electric fuel pump is supposed to run as long as the circuit is on, which putting the key on does. In fact, the fuel system operates under some pressure and in order to start when you turn the key to start position, the fuel pump must go on and begin the flow/pressure up before the engine actually needs the gas. Frequently in especially older cars or those with some part of the fuel system failing (especially when it leaks/loses pressure quickly), it is common that the key must be turned to on for a longer moment so the system can purge & establish itself before starting.

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โˆ™ 2006-04-21 15:34:58
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Q: Why would a fuel pump run continously when the key is in the on position does this indicate a bad pump relay or fuel line?
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