Oil pressure sending unit switch.
We are giving you all of the information related to the oul pressure sending unit switch in the 84-87 Buick Turbo Regal and 89 TTA
.
VEHICLE APPLICATION:
Buick Regal, T-Type, Turbo T, Limited, Grand National, GNX, and 89 TTA
SWITCH NAME:
Oil Pressure Switch sending unit
PURPOSE OF SWITCH:
The switch senses oil pressure. The switch allows engine to start if the fuel pump relay goes bad.
The sending unit turns on the “oil/choke” dash warning light when oil pressure goes below 4 psi.
TURNS ON-OFF / FUNCTIONS / USED WHEN:
It is used upon start up of vehicle, as well as in constant use while engine is running.
LOCATION IN VEHICLE:
The sending unit is located on passenger side. It is near bottom of engine, towards the front, next to the oil filter housing. It can be located by following the oil line going to the turbo. Follow the line down and you will see a brass fitting. The unit is screwed to the brass fitting. There will be 3 wires and a black connector. There will be a plastic black shield that can be opened.
ORIGINAL GM PART NUMBER: 25036378
SWITCH / BASE COLOR: metal and black
CONNECTOR PLUG COLOR (SWITCH SIDE): black
3 WIRES ATTACHED (SWITCH SIDE): Pink with a black tracer,tan, and gray.
CONNECTOR PLUG COLOR (HARNESS SIDE): black with a black clip that can be opened to access the connector.
NUMBER OF WIRES ATTACHED (HARNESS SIDE): 3
COLOR & PURPOSE OF (HARNESS SIDE) WIRES:
pink-black “A”, goes to (junction) to FP/INJ fuse
(also connects to fuel pump relay)
(also connects to [junction] brown wire to fuel injectors)
tan “B”, goes to (junction) to oil/choke indicator (instrument cluster light) “2”
gray “C”, goes to (junction, tan-white wire) positive for fuel pump
(connects to fuel pump prime connector)
(junction connects to other things)
PHOTOS OF SWITCH AND CONNECTED WIRES:
.
84-85 ecm fuel pump oil pressure switch.
.
OTHER NOTES:
Labelled “engine oil pressure switch” on diagrams.
[switch opens at 4 psi] Anything less it will not start.
This is a self grounding switch.
Caution: If you leave the connector off and it shorts out it will kill the fuel pump. We fixed many a blown fuse due to this. If not plugged in make sure the lead is taped up to prevent a short.
