on a 2.8 Lt engine its by the oil filter
With a 4.3L engine, the oil pressure sending unit is in the back of the engine just to the drivers side of the distributor.
Locating on a 2000 s10 pickup truck: bronzer idea
In the fuel tank. Fuel tank must be removed to gain access to the sending unit.
how do you change the oil pump on a 1991 s10 pickup
The fuel level sending unit in the tank is probably at fault.
It is mounted on the top of the fuel sending unit that goes in the TOP of the fuel tank.
At the rearmost section of the engine to the right of the distributor.
If it has the 4.3 engine, I remove the distributor to gain access to the oil pressure switch.
how do you replace the fuel sending unit
If you suspect the sending unit may be faulty just replace it with a new one, they are not expensive but a little difficult to remove and replace.
It is on the fuel sending unit and that is what goes in the top of the fuel tank. You will need to drop the tank are raise the bed up to get to it.
In back of engine, on top, drivers side, close to distributor.