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Discussion Starter · #1 ·
My fuel filter light flickers when my truck is idling. When I move off idle the light goes off. I would think if the filter is plugged this would be the other way. By the way the filter is not that old.
 

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Check the wire coming off of the switch and see if it might have a bare spot in it touching ground.
 

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Discussion Starter · #3 ·
Why would it just flicker at idle and not all the time, if it was a ground issue
 

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Engine vibrations change from idle to higher RPM. You might also check the vacuum switch. Just unhook it and see if the light still flickers. It obviously isn't a fuel filter stopped up, because it only flickers at idle only.
 
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