Where is Chevy 4.3 liter oil sending unit?

The location of the oil pressure sending unit on a Chevy 4.3L engine depends on the year of the vehicle. There's no single universal location. It's generally found on the engine block itself, near the oil filter but the exact position varies. It might be on the driver's side, passenger's side, or even at the back of the engine near the oil filter.

To find it definitively, you need to:

1. Consult your vehicle's repair manual: This is the most reliable source. The manual will have diagrams showing the exact location.

2. Use a parts diagram: Online parts stores (like AutoZone, Advance Auto Parts, etc.) often have searchable parts diagrams. Enter your vehicle's year, make, and model to find the diagram for your engine, and the oil pressure sending unit should be shown.

3. Visually inspect the engine: Look for a small, usually threaded sensor with one or two wires connected to it, located near the oil filter and oil passages. It's often a cylindrical unit.

Be cautious when inspecting. The engine will be hot if recently run, so allow it to cool completely before working around it.