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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
I'm working on my 87 z28 I recently picked up. In the process of trying to hunt down the wiring for the temp gauge I came across another plug but I can't figure out where it goes. I remember seeing it on my other third gen but can't place it.
It comes from around the distributor and oil pressure sensor area.
That is the plug for the oil pressure switch that runs the fuel pump . The orange and tan with white tracer wires are the giveaway on that .
Where there are only two wires on it , you must have had two units screwed into the block monitoring the engine's oil pressure , that one with it's two wires for the fuel pump and a different one with one wire for the oil pressure gauge on the dashboard .
That switch , BTW works in parallel with the fuel pump relay in that either/or will supply power to the fuel pump under the right conditions (when there is oil pressure and/or when the ECM tells the fuel pump relay to actuate .....
That is the plug for the oil pressure switch that runs the fuel pump . The orange and tan with white tracer wires are the giveaway on that .
Where there are only two wires on it , you must have had two units screwed into the block monitoring the engine's oil pressure , that one with it's two wires for the fuel pump and a different one with one wire for the oil pressure gauge on the dashboard .
That switch , BTW works in parallel with the fuel pump relay in that either/or will supply power to the fuel pump under the right conditions (when there is oil pressure and/or when the ECM tells the fuel pump relay to actuate .....
The car has been converted carb so I shouldn't need it but at least I know what it is now. Thank you very much.
Back to my hunt for the engine temp sender wiring....
The car has been converted carb so I shouldn't need it but at least I know what it is now. Thank you very much.
Back to my hunt for the engine temp sender wiring....
If you are running a mechanical fuel pump with your carb setup and are not using the in tank electric pump you are right , you don't need those wires . Is the electric pump still in place and your using the mechanical pump to draw through it ? I would think in that situation it would flow fuel better if the original pump was removed ? But if you have no fuel delivery problems I guess I'd leave it till some other time ya end up having to work on the fuel tank , like if the gauge sender dies .
Oh , and , if your looking for the wire under the hood that controls the coolant temperature gauge , it'll be a solid green wire that's thinner (smaller gauge wire) than the ones for your fuel pump are .
I enjoyed reading your posts OrangeBird. I remember when I first joined TGO and if I would have received an answer like vango posted probably would not be on here today.
I enjoyed reading your posts OrangeBird. I remember when I first joined TGO and if I would have received an answer like vango posted probably would not be on here today.
Hi Edward ,
Rusty and I talked and he told me he meant no meanness , it's understandable that sometimes things don't look the same in print as they do if we were just hanging out talking cars , so I'm all for giving the guy the benefit of the doubt and Rusty has MY apologies for jumping on him before speaking with him first .
Last edited by OrangeBird; 04-16-2016 at 04:32 PM.
04-13-2016, 03:59 PM
Hi Edward , 