Location of oil pressure switch in a chevy blazer s-10 1992

At the very back to the right of the distributor. Not a fun job, but they do come out.

The Oil Pressure Switch is located:Under hood, center, rear engine area, driver side of distributor, mounted in block. Here's what it looks like.he oil pressure switch is mounted to the top rear of the engine.

1. Remove the electrical connector from the switch.
2. Remove the oil pressure switch.
3. To install, reverse the removal procedures.

I will assume this is a 4.3 engine, the oil pressure /fuel switch is located on the rear of the engine next to distributor, what is the problem?

If you didn't damage the fuel pump with the dry run, and the relays are new, and the wiring is connected properly, it should work. If you have checked all the fuses in the fuse panel and none are blown, I don't think the fuse would be anywhere else. I've got one idea you can try. It's a long shot, but I've seen it happen several times. The oil pressure sending unit or switch, is tied into the fuel pump wiring. If the oil pressure switch is bad, or the oil pressure is low, the fuel pump will be shut down. Disconnect the oil pressure switch and use a piece of wire or a sturdy paper clip and make a jumper wire. Plug the jumper into the end of the oil pressure switch wiring connector and try the ignition to see if the fuel pump works. If that doesn't work, I'll do some research on the fuse location. Good luck.

There's something you can do to check if the oil pump is still working screw off the oil filter and start it only for a few seconds if oil shoots out the pump is working if it doesn't the pump could be clogged or it lose prime if it's working check the wire going to the oil pressure switch may be broken.

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.

gauge or sender may be faulty

Look at back of engine on drivers side of distributor, screwed into block.

The fuel pump relay is only for the fuel pump priming when you turn on the key. After the vehicle starts the oil pressure switch takes over and runs the pump. If the pump is shutting off after the motor is running the oil pressure swith is probably bad. Let me know if i can help you further.

nothing ..normal low pressure at idle while hot ...but really should be thinking fresh oil change and filter soon..also what are the RPM's at idle hot in gear with A/C radio and other accessories running?