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What does fuel pump relay do on 94 s10 blazer with 4.3liter v6 engine?

In a 1994 S10 Blazer with a 4.3L V6 engine, the fuel pump relay acts as a switch, controlling the electrical power to the fuel pump. Specifically:

* When the ignition is turned on (or the engine is cranking): The relay closes, completing the circuit and allowing electricity to flow from the battery, through the relay, to the fuel pump. This energizes the fuel pump, allowing it to pressurize the fuel system.

* When the ignition is off or the engine is not running: The relay opens, breaking the circuit and cutting power to the fuel pump. This prevents the fuel pump from running unnecessarily and draining the battery.

Essentially, it's a safety and efficiency device, ensuring the fuel pump only operates when needed. A faulty fuel pump relay can prevent the engine from starting because the fuel pump won't activate.

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