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Hey Freda==The oil pump is turned by the engine so when the rpm 's drop the pump isn't turning as fast and the preasure drops. It depends on what the mileage is and how the engine was taken care of as to how much it varies. Goodluck Joe

Oil guage stops fuel pumpI just experienced the exact same situation with my 1989 Chevy Beretta 4 days ago. (Ive owned the car 7 days.) I pulled up to a stopsign, stalled and saw the oil pressure guage had dropped to "zero". It hasn't done it since. BUT now my oil pressure guage lays at "zero" if idling, and rises to just under half while driving. After some research, I learned that in older cars like mine,(1989), the car stops pumping fuel if the oil guage sensor registers under the default level preset in the cars computer. Hope this helped.
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Q: Why does a car's oil pressure hand drop and cut off at red lights?
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