Tell me how to bypass the oil pressure sender
#1
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Tell me how to bypass the oil pressure sender
It's a 92' 5.0 TPI. Oil pressure sender located right above the oil filter.
Here's the situation. Somehow the electrical connector to the sender roasted on the exhaust and won't work anymore. The car can't see the oil pressure and thus cuts the fuel pump off from working. I know the car has oil pressure as I'm running a sender for my Speedhut gauge from the port on the back china wall. The car is my daily and I need to get it running NOW and can't wait the 1-2 weeks for a replacement pigtail connector.
I know you can bypass the sender by doing some searching on here but no one tells me sepcifically how to do it. What wires can I splice at the fuel pump relay to get the dame fuel pump to run? Please help.
Here's the situation. Somehow the electrical connector to the sender roasted on the exhaust and won't work anymore. The car can't see the oil pressure and thus cuts the fuel pump off from working. I know the car has oil pressure as I'm running a sender for my Speedhut gauge from the port on the back china wall. The car is my daily and I need to get it running NOW and can't wait the 1-2 weeks for a replacement pigtail connector.
I know you can bypass the sender by doing some searching on here but no one tells me sepcifically how to do it. What wires can I splice at the fuel pump relay to get the dame fuel pump to run? Please help.
#4
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Re: Tell me how to bypass the oil pressure sender
If you try to bypass it the pump will run all the time. You would need to run accessory power to the grey wire.
The grey wire is also located at the pump relay so you can tap it there. It might work if you took the pink wire of the ignition coil and ran a wire off it to the grey wire at the pump relay.
http://tpiparts.net/inc/sdetail/4342/3995
The grey wire is also located at the pump relay so you can tap it there. It might work if you took the pink wire of the ignition coil and ran a wire off it to the grey wire at the pump relay.
http://tpiparts.net/inc/sdetail/4342/3995
Last edited by Tuned Performance; 11-20-2017 at 12:07 PM.
#5
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Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: Tell me how to bypass the oil pressure sender
According to that diagram, and what I thought to begin with, the switch portion of the oil pressure sender doesn't actually do anything unless the relay fails. It is just a bypass for a bad relay as far as I can tell.
#7
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Re: Tell me how to bypass the oil pressure sender
The oil pressure switch and fuel pump relay are run parallel, NOT in series. They do not have an affect on each other. If one or the other goes bad it is inconsequential. If they both go bad, which seems likely in your case, the pump gets no power. Replace the relay, then fix the plug when you get it.
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#8
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Thread Starter
Re: Tell me how to bypass the oil pressure sender
OK, I've replaced the relay and I have the pigtail on it's way. But a question... If what you say is true, and they run parallel and not in line, then logically if the Oil Pressure sender was left unpluged, the fuel pump would still get power from the relay and the only thing lost would be the function of the stock gauge. But this isn't the case, I tried and the car still won't start. Why is that?
#10
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Re: Tell me how to bypass the oil pressure sender
No. It doesn't come on at all. No prime, no fuel pressure at the rails (checked with a gauge). I know the pump is good as I tried jumping the terminals at the relay and it comes on and shows fuel pressure. This makes me think they do infact run in series... otherwise what else could cause the fuel pump to "sleep" without the oil pressure sender hooked up?
Last edited by MeenZ28; 11-22-2017 at 01:50 PM.
#12
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Car: check
Engine: check
Transmission: check
Re: Tell me how to bypass the oil pressure sender
No. It doesn't come on at all. No prime, no fuel pressure at the rails (checked with a gauge). I know the pump is good as I tried jumping the terminals at the relay and it comes on and shows fuel pressure. This makes me think they do infact run in series... otherwise what else could cause the fuel pump to "sleep" without the oil pressure sender hooked up?
RBob.