Where is the oil send unit on a 1991 Chevy S10 6 cylinder 4.3L?

SOURCE: 2001 chevy venture oil sending unit

HI..
On a problem with oil pressure sensor leaking.
99% you need to replace the sensor with a new one.
Because if you can see the leak is not for the tread or gasket of the sensor.
If you can disconnect the the wire from the sensor.
and try to start you will see the leak coming from inside on the plastic, where the pins. of the sensor.

OK.. I hope this information work for you.
I work on Cars everyday.
Thank you fo use fixya.

SOURCE: what is a oil sending unit on 99 chevy venture van?

easy to change u just need a special tool for removed on front of motor at right of oil filter its look like a coolant sensor or a little bottle with a connetor removed the connector and take the tool to remove

SOURCE: Where is the oil sending unit located on a 2003 Chevy Tahoe 5.3 engine

its in the block behind intake manifold .

SOURCE: oil sending unit

It should be on the rear top of your engine block next to the intake. Three wires goes to it if its a 4.3

SOURCE: 1991 chevy S10 blazer fluctuating oil pressure

I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.

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