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| 3800 Fuel Pump Relay Wiring Question (Page 1/1) |
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Jasperr
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DEC 19, 07:56 PM
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Hello, ran into some confusion here when I got to the point of wiring the fuel pump relay to the C203 plug. I'm following the diagram below (which I've upscaled about 2x from the original that's floating around if anyone wants an HD version).
Question is, the relay has five or six wires in it and I assume the ones not pictured get the delete? But there happen to be two orange wires with a black stripe and I don't know how to tell which one I need to punch into the C203.
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Dennis LaGrua
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DEC 20, 07:38 PM
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The relay should only have PCM power and a gnd to the relay coil and power in and out to the fuel pump. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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Jasperr
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DEC 20, 10:45 PM
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| quote | Originally posted by Dennis LaGrua:
The relay should only have PCM power and a gnd to the relay coil and power in and out to the fuel pump.
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Ok, so then the result would be not having the oil sensor go though the relay correct?
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olejoedad
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DEC 21, 09:50 AM
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The oil pressure sending unit does not 'go through' the relay.
The power cicuit from C203 to the relay is also attached to the oil pressure sending unit pressure switch .
When engine oil pressure is achieved, the pressure switch in the relay closes to provide a backup power source to the fuel pump in the event that the fuel pump relay fails.
The power to the oil pressure switch is the orange/ black wire, the power from the pressure switch to the pump is the tan/white wire.
I recommend the inclusion of the circuit.
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olejoedad
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DEC 21, 09:59 AM
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This image from the FSM provides more detail.
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qwikgta
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DEC 24, 03:10 PM
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