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you must have a short to another power circuit unplug the pump and chk the pwr wire to see if it still has pwr if it does trace the wire to find the short I FOUND ON MY 98 Chevy S-10 THAT THE OIL PRESSURE RELAY ACTS AS A DUAL BACKUP FROM BATTERY THAT WILL ALSO TURN FUEL PUMP ON ALL THE TIME IF IT IS BAD EVEN WITH THE KEY OFF

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โˆ™ 2007-09-19 13:01:03
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Q: How can fuel pump work with no relays installed and still not shut off?
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