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Old 01-04-2004, 03:56 PM   #1
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oil pressure fuel cut off switch

Can anyone tell me where the oil pressure fuel cut off switch is located on a 88 Camaro TBI?
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Old 01-04-2004, 05:07 PM   #2
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Not sure where it's loacted on your car, but on mine it was on the back of the block next to the oil pressure sender.
It's not a fuel cut off switch either, it is a backup for the fuel pump if the fuel pump relay goes bad.
With a bad relay, fuel pump will activate when the switch sees 3-8 psi, can't remember the actual psi. It was designed to keep you from getting stranded.
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Old 01-04-2004, 05:37 PM   #3
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Thumbs up yes yes it dose that one other funcion......

It Work as a back up yes and it should when functioning Right it sure Also shut engine down if it loses OIl PSI too........

[COLOR=red]It's located:

It should be at the back of the block at the edge of your intake manifold...
or to be generic about it's right under your distributor.....

if you pull the dist. out you can easly see it and acess it .......


Good luck Man.................
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Old 01-04-2004, 10:37 PM   #4
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Re: yes yes it dose that one other funcion......

Quote:
Originally posted by 91 GTA Ramair2
Also shut engine down if it loses OIl PSI too........

Nope, only way I can see it shuting off the engine is if your relay is bad and you have 0 oil psi. If the relay is good, car will run with no oil in it.
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Old 01-04-2004, 11:45 PM   #5
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If you truly lose ALL of your oil pressure, say the pump-shaft fails; the switch will close and shut off your fuel pump in a second! If your dash gage sender goes out, but you still"really" have oil pressure the switch will allow the car to run. They are tied to the pump relay, where they do the shutting off function, and if it fails, you're not going to start that car...
It's supposed to be a safety device to cut off the pump in the event of an accident.
That's why when you turn your key on w/o starting the engine the fuel pump will not stay running.
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Old 01-04-2004, 11:56 PM   #6
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Quote:
Originally posted by 90rocz
If you truly lose ALL of your oil pressure, say the pump-shaft fails; the switch will close and shut off your fuel pump in a second! If your dash gage sender goes out, but you still"really" have oil pressure the switch will allow the car to run. They are tied to the pump relay, where they do the shutting off function, and if it fails, you're not going to start that car...
It's supposed to be a safety device to cut off the pump in the event of an accident.
That's why when you turn your key on w/o starting the engine the fuel pump will not stay running.
Ford has the setup you are referring to. The way it is wired in the 3rd gen cars is the oil press switch AND the fuel pump relay are wired in parallel to the fuel pump.
The oil press switch is normally open and closes when pressure is received, no pressure, it opens and cuts power to teh fuel pump, but the relay is still sending power to the fuel pump.
We had this debate on thirdgen.org a year or two ago already.
The way I said it works is the way it works, no if, ands, or buts about it.

Oh, and the reason the fuel pump only runs for 2 seconds is just to prime the system, there is no need to have the pump running when the engine isn't running. The ecm will turn the pump on as soon as it gets a signal from teh distributor that the engine is turning.
The oil pressure switch doesn't activate until the motor spins 4 or 5 times. If you don't believe me, go unplug your fuel pump relay and try and start your car.

Last edited by Zepher; 01-05-2004 at 12:01 AM.
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Old 01-05-2004, 12:05 AM   #7
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Wait a sec, they said if you removed the FP relay the engine should still run, BUT only with oil pressure at the "oil/FP switch". ...
I think I'm still right on this one...sorry
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Last edited by 90rocz; 01-05-2004 at 12:08 AM.
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Old 01-05-2004, 12:12 AM   #8
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Quote:
Originally posted by 90rocz
Wait a sec, they said if you removed the FP relay the engine should still run, BUT only with oil pressure at the "oil/FP switch". ...
I think I'm still right on this one...sorry
Well, if you look at my post above, I mention that the car will turn off with 0 psi if the relay is bad. If the relay is good, car will run until the motor seizes with no oil press.
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Old 01-05-2004, 12:19 AM   #9
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Yep, then you would be right, sorry...
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Old 01-05-2004, 11:07 AM   #10
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So then GM wired it so you can blow them up ....Cool ****........

I thought the 91+ had a an oil pressure shut down switch.....
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Old 01-05-2004, 11:20 AM   #11
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Quote:
Originally posted by 91 GTA Ramair2
So then GM wired it so you can blow them up ....Cool ****........

I thought the 91+ had a an oil pressure shut down switch.....
I do know that they used a different sender and switch in the later cars but it still functions the same.
On my 86, the switch and sender were behind the intake on the top of the block attached with a y junction. I believe on the later cars that it was an all in one unit mounted above the oil filter. But they do the same thing.
Unlpug your sender/switch and see if the car still runs, that would be an easy test.
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Old 01-05-2004, 12:00 PM   #12
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Talking

I was standing around The local Dealer when myBrother was having his 88Formula Inspested and he was telling this about my 91GTA......

But your right my 87 Z-28 and 91GTA had a sencor by the oil filter......But I not sure if the 87 GTA dose or not I think so.....
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Old 01-05-2004, 12:00 PM
 
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