Why does the fuel pump run when the key is on but engine off?
Simply put, the fuel pump runs for a few seconds when you turn the key to the “on” position to build up the necessary pressure in the fuel system for the engine to start immediately and run smoothly. This is a deliberate and critical design feature of modern fuel-injected vehicles, not a malfunction. It’s often …
Why does the fuel pump run when the key is on but engine off? Read More »