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1998 Chevy Tahoe Fluctuating Oil Pressure Guage

Tiny
TAHOEBOB02
  • MEMBER
  • 1998 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
Why would my Oil Pressure guage start to flutuate from 0 - 60 PSI while driving? The Oil is full. Sometimes it will stay at 40PSI.

Is this also known as a Fuel Pump Oil Pressure Switch and Sender.
Wednesday, May 14th, 2008 AT 7:33 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Replace the oil pressure sending unit. This sends signal to th gauge and yours is bad
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Wednesday, May 14th, 2008 AT 7:36 PM
Tiny
TAHOEBOB02
  • MEMBER
  • 8 POSTS
Is this also known as a Fuel Pump Oil Pressure Switch and Sender.
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Wednesday, May 14th, 2008 AT 8:39 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Tahoebob02, The oil pressure sending unit is wired in series with the fuel pump. If the oil pressure drops to zero, the fuel pump will shut off, thus shuting off the engine. I never heared the oil pressure sending unit called the "fuel pump oil pressure switch and sender"--but I guess you could call it that.
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Thursday, May 15th, 2008 AT 5:04 AM

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