Open the Dash at the bottom and then look to the bottom left of the relay panel
On a 1988 Mazda 626, the fuel pump relay is located in the fuel tank. Always disconnect the battery before beginning work on a fuel system.
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The fuel pump relay switch, on your Mazda automobile, is located on the outside of the gasoline tank. The relay switch will be just above the fuel line.
That other relay should be the AC compressor relay.
In the tank
The fuel pump relay on a 2002 Mazda 626 is located in the engine compartment on the driver's side. It is in a bank of relays just behind the battery location.
Your 1991 Mercury fuel pump relay switch is located on the firewall of the engine compartment. The relay switch will be near the center of the firewall.
On the 2006 Mazda 6, the fuel pump relay is typically located in the engine compartment relay box. This box is situated near the driver's side, close to the battery. To access the relay, you'll need to remove the cover of the relay box and identify the fuel pump relay by consulting the diagram usually found on the underside of the cover.