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Oil pressure sensor

Tiny
DIRTMAN616
  • MEMBER
  • 2002 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Can anyone tell me where the oil pressure switch/sending unit is? Having fuel pump issues and trying to find out if it's killing the power to the fuel pump. I think I see it. Does it have just a two prong plug-in and sit vertically on the intake manifold? Also, security light flashing. What do do about that too?
Thanks
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Monday, September 20th, 2010 AT 3:33 PM

12 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Engine oil pressure (EOP) sensor is on the top rear of the engine, near the distributor for the 4.3L motor. yes it does have a 2 prong connector this pic below should help pinpoint it If security light is flashing than that is what is stopping power to the fuel pump, not the oil pressure sensor. Try using a spare key to see if that helps.


https://www.2carpros.com/forum/automotive_pictures/261618_Graphic_693.jpg

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Monday, September 20th, 2010 AT 7:07 PM
Tiny
DIRTMAN616
  • MEMBER
  • 8 POSTS
Well, thanks for the pic but that's not what what my engine configuration looks like. Vehicle is a 2002 ZR2 Blazer.
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Wednesday, September 22nd, 2010 AT 7:58 AM
Tiny
DIRTMAN616
  • MEMBER
  • 8 POSTS
Sorry, my mistake. I found it with the help of your diagram. Had to pull the distributor to get at it.
Thanks
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Wednesday, September 22nd, 2010 AT 2:08 PM
Tiny
SANHAR
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 116,000 MILES
Where is the oil pressure switch located 2x4 vortec engine?
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Monday, December 28th, 2020 AT 1:35 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Your vehicle uses an oil pressure sensor and it is located on the top rear of engine, near the distributor. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, December 28th, 2020 AT 1:35 PM (Merged)
Tiny
MIKEY4546
  • MEMBER
  • 2 POSTS
  • 1999 CHEVROLET BLAZER
Engine Mechanical problem
1999 Chevy Blazer 6 cyl Four Wheel Drive Automatic

I see in the book that the oil pressure switch will keep the fuelpump from kicking on. Will low oil pressure activate the pressure switch and disable the pump. Pressures on the fuelpump were tested and are all within range of the guidlines in the book.
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
The oil pressure switch turns the pump on when the oil pressure reaches about 10 pounds. A defective switch is usually easy to figure out. The engine will start and run a couple seconds and shut down because the pump shuts off.
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
JOJOELAINE
  • MEMBER
  • 2 POSTS
  • 1993 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 71,000 MILES
Oil sending unit replacement, how much should something like this cost approximately.I have a oil leak but its not seepage, my engine runs great, no smoke, no change in oil gauge. Leaks about a 2 inch smear in 8 hours. Could it be anything else.
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
To my guess that the sending unit can be up to about $22.00. It is lockaed under hood on the passengers side lower engine above pan. Sometimes they do leak and go bad like any other part. Make sure it is the sending unit that is leaking before buying a new one.
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
BGMACDONALD
  • MEMBER
  • 1 POST
  • 1987 CHEVROLET BLAZER
Engine Mechanical problem
1987 Chevy Blazer V8 Four Wheel Drive Automatic

Hi. I'm a new member and I have a question. I'm rebuilding my motor and am looking for the adaptor that screws into the block into which screws the oil pressure sending unit. Why can't I find one? Thank you
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
If you are using a factory gauge, then it's just a standard pipe thread.

If you are using an aftermarket mechanical gauge you will probably have to buy a kit that comes in a small bag to connect compression fittings to pipe thread fittings.
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Monday, December 28th, 2020 AT 1:36 PM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Normally when you buy an oil pressure switch or sending unit they are one-eighth inch pipe threads. They sometimes come with an adapter for the one-quart inch threads in the engine block. They also make 45 and 90 degree adapters to gain easier access or clearance as well for the distributor or firewall. I've attached pictures below of a new oil pressure sending unit as well as what a 45 and 90 degree adapter elbow looks like. Hope this helps and thanks for using 2CarPros.
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Thursday, December 31st, 2020 AT 8:18 PM

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