1987 Mustang fuel pump relay
The fuel pump relay for mustang is located under drivers seat
The relay number is C2027.
See below the fuel pump relay diagram shown :----
Thanks.
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Here's the electrical schematic for your vehicle. There is a Grey wire leading back to the fuel pump from the relaythat should show having 12 volts on it when your fuel pump relay cycles on at key on. A quick check just in case you are wanting to see if the relay is OK is to swap with a similar relay in the electrical center where the FP relay resides.
You must verify that you are receiving a full 12 volts of power back to the fuel pump Grey wire at the times you are having the failure. If you hear the fuel pump relay working, and the pump does not run, Fuel pump Power and Ground must have good integrity. There may be an intermittant fuel pump ground circuit failure, or what is not common but can happen, is there is a failrue within the Relay wiring that is breaking down under load and reducing the full 12 volts back to the pump somehow. Possibly thru connector C100 or C200. The connector right at the fuel pump module on top of the tank can be a problem too. If everything checks good back to the pump and the ground is good, then you have another bad pump.
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