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I have a 2003 Ranger 500 and I do a lot of night riding .
I have a habit of stoping and killing the engine and leaving the key on so the light's will stay on .
Question is : Does the fuel pump shut off when it build's to a certain preasure or does it continue to pump ? I have not had any problem so I am assuming it cut's off but it bother's me not knowing .
I could rewire the light's but don't want to unless it is necessary.
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The answer to your question is the pump will use a little power with the key on but not as nearly much as it would be if it was running. The thing you do need to remember is there is other sources of leakage that will drain power depending on the model like the ecm and the ecu on the fuel injected models or even reverse draining through the charging system because the engine is not running.
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