* The engine stalls while driving. This can be caused by a faulty fuel pump relay that is intermittently losing power. When the fuel pump relay loses power, the fuel pump stops working and the engine stalls.
* The fuel pressure is low. This can be caused by a faulty fuel pump relay that is not providing enough power to the fuel pump. When the fuel pressure is low, the engine may run rough or stall.
* The fuel pump relay is making a clicking noise. This noise is often a sign that the fuel pump relay is faulty. When the fuel pump relay is making a clicking noise, it is not able to properly switch power to the fuel pump.