Where is the fuel and power cut-off relay generally installed in a car?
3 Answers
Install it under the front decorative panel. Remove the front decorative panel, place the device face up underneath it. Cut the fuel pump wire, connect one blue wire of the cut-off relay to each side, connect the white wire to constant power, and connect the yellow wire to the fuel cut-off line on the anti-theft device. Here is some related information: Relay: A relay is an electronic control device with a control system (also known as the input circuit) and a controlled system (also known as the output circuit), typically used in automatic control circuits. Function: It essentially acts as an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays roles in automatic regulation, safety protection, and circuit switching in electrical circuits.
I've always been interested in car interior components and often tinker with maintenance work myself. The fuel and power cut-off relay, which controls the sudden stoppage of fuel supply and power to the vehicle, is usually hidden inside the relay and fuse box. It can be found either in the engine compartment near the battery or firewall, or in a small box under the dashboard on the steering wheel side in the cabin. For example, in my old Japanese car, it's tucked under a plastic cover in the engine bay, right out in the open. The placement is quite thoughtful, mainly for shock absorption and to allow mechanics quick access for operations. If it fails, the car might just stall and become immobile, so don't rush before parking—check the manual first to locate it precisely to avoid fumbling around blindly. During inspection, simply unscrew the bolts to see the relay socket, and a quick test with a multimeter will tell if it's working. Honestly, such issues aren't too complicated, but if a beginner isn't familiar, accidentally disturbing nearby circuits could cause bigger trouble.
As an ordinary office worker who has been commuting by car for over a decade, I find power or fuel cutoff issues quite frustrating. Relays are usually installed in black boxes under the hood or in hidden compartments near the steering wheel. I don't think they're hard to locate—my car has a small drawer cover under the driver's seat, and lifting it reveals various small relays, like those managing the fuel pump and circuit switches. Their placement isn't particularly hidden, but safety is key since they can urgently cut power and fuel lines to prevent accidental fires. If your car suddenly stalls on the highway, it can be terrifying. I recommend first checking the owner's manual for diagrams—unlike me last year, when I forcibly removed the fuse box cover and ended up breaking a wire, costing over 500 yuan to fix. So, if you're unsure after a quick inspection, just drive to a professional repair shop. It'll save you both hassle and worry.
