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Fuel Pump Relay: Locations The fuel pump relay is an integral part of the Integrated Relay Control Module (IRCM). The IRCM is mounted under the hood, on the driver's strut tower.
It's located in the trunk on the drivers side. You should see a black and yellow sticker below a hole indicating that the fuel pump shut off switch is here. Even if your sticker has worn off, if it's a 92 topaz it most likely will be there in that hole. Shine a flashlight in it and you should see a black unit with a red button on top. Push the button down until it clicks in place. If the button is already down, your problem is something else.
I had the same problem. It was the idle air control valve. It sits on top of the intake just downstream from the throttle. There's a valve rod inside that gets worn over time and starts to stick. If that's what is causing your problem, you need to replace the unit.
1991-92 Mercury Topaz Stereo Wiring
Constant 12V+
Green/Yellow
Switched 12V+
Yellow/Black
Ground
Red/Black
Illumination
n/a
Dimmer
Blue/Red
Antenna
Right Front
Front Speakers
6 1/2" Doors
Left Front (+)
Orange/Green
Left Front (-)
Black/White
Right Front (+)
White/Green
Right Front (-)
Black/White
Rear Speakers
6" x 9" Rear Deck
Left Rear (+)
Pink/Green
Left Rear (-)
Pink/Blue
Right Rear (+)
Pink/Blue
Right Rear (-)
Green/Orange
92 topaz
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