Where is the gas shutoff relay on a 1990 Dodge Colt?

There isn't a dedicated "gas shutoff relay" in the same way some modern cars have a fuel pump relay that's easily identifiable and accessible for safety. The fuel system on a 1990 Dodge Colt is controlled indirectly. The fuel pump is controlled by the powertrain control module (PCM) or possibly a simpler circuit dependent on the engine type (some had carburetors, others fuel injection).

To stop the flow of fuel, you need to either:

* Disconnect the battery: This is the safest and most reliable method to shut off the fuel pump's power. This will stop the engine immediately.

* Locate the fuel pump relay (if one exists): This relay, if present, would be in the fuse box under the hood or possibly inside the car's interior fuse panel. The relay's function is to provide power to the fuel pump when the ignition is on. However, it's unlikely to be labeled "gas shutoff relay" – it'll probably be labeled something like "Fuel Pump" or just have a number. Refer to your owner's manual or a repair manual for a 1990 Dodge Colt to find its location and how to identify the correct relay. Even then, removing this relay is not guaranteed to immediately stop fuel flow. Some fuel might still be in the lines.

In short, there's no single, easily accessible "gas shutoff relay" on a 1990 Dodge Colt like in newer cars. Disconnecting the battery is the most effective and reliable way to stop fuel flow in an emergency. If you need to locate a fuel pump relay, consult your owner's or a repair manual.