Redfish
Full Access Member
- Joined
- Nov 6, 2021
- Posts
- 2,605
- Reaction score
- 14,080
- Location
- Prairieville, LA
- First Name
- Andrew
- Truck Year
- 1987
- Truck Model
- V1500
- Engine Size
- 350/5.7
Jacob, the oil pressure switch that is under the distributor is actually a back up and not a permissive. I also thought like you, I even misinterpreted the wiring diagram. It will complete the circuit when it senses oil pressure even if the primary side of that system were to fail. Not sure why...oil pressure sensor by the oil filter? This is a later block with tbi heads up. The oil pressure switch is what kicks on the fuel pump correct? Or am I dreaming that up? I’m pretty sure I read somewhere if it doesn’t sense oil pressure it won’t power the fuel pump so you don’t destroy things? Maybe? But what around should the oil sensor be? I’ve changed the oil twice in this truck and I haven’t been able to find it. and like sand through the hour glass, these are the days of our lives.
Your oil pressure sending unit on a 1987 TBI 350 should be very obvious when you are changing your oil filter.
I just crawled under the truck and took this pic for you:
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Since you have been working on the slave cylinder a lot recently you should have no trouble deciphering the pic. The Oil Pressure Sending Unit is in the pic between the O2 sensor and the slave cylinder but obviously is slightly above both. The wire should be coming from above, close to the firewall.