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Oil sending unit or oil pump?

 
Old 02-06-2019, 08:22 AM
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Default Oil sending unit or oil pump?

I just started having my oil gauge shoot down ever minute or so. How do I know what is wrong? I have a 2002 f-150.
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Old 02-06-2019, 08:24 AM
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Originally Posted by Pg1500 View Post
How do I know what is wrong?
you diagnose it.
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Old 02-06-2019, 09:50 AM
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The oil pump can't drop pressure that fast, and recover. And your truck doesn't actually have a sender - it has a 6psi switch, and a resistor built into the gauge head. Together, they only allow the gauge to show no pressure, or mid-scale. Because the resistor was integrated into the gauge after '95, you can't revert to a sender & make yours work (without also changing the gauge head to an '87-95), so your quickest fix is to simply replace the switch.


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