Question about 2003 Chevrolet Cavalier
A failing fuel pump is the most common cause of a low-pressure situation. The battery should be completely unrelated; it's either a bad battery or a parasitic draw. Fuel pumps do not have access to key-off batt voltage, therefore cannot cause a parasitic drain. However, there are many things which can cause a parasitic drain. This can be determined by removing the ground cable from the battery and hooking up an ammeter in-line between that cable and the open negative post on the battery. A normal key-off drain is 20-50 mA (to power the clock/ECM/etc...make sure no interior lights are on while your doing this). More than that means there is a malfunctioning component somewhere w/ access to constant battery voltage.
Posted on Sep 29, 2009
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Posted on Jan 02, 2017
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