If you want to be certain your fuel pump relay is bad, you can try to listen for those same noises from outside your car. With your car ignition on, move over to the fuel tank area of the vehicle. Crouch next to the fuel tank and listen for a hum or whine. If you cannot hear any noise, you may have a problem with your fuel relay.
What does a bad fuel pump relay do?
A faulty fuel pump relay prevents your engine from running as the fuel is not supplied. There are many signs of a bad fuel pump relay including loss of power, engine not starting, pump not making the common noise, and vehicle getting on fire.
How do you test a fuel relay?
What can a bad relay cause?
If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system. This will cause the vehicle to immediately stall due to fuel and spark being cut off.
Related Question How do I know if my fuel pump or relay is bad?
How do you test if a relay is good or bad?
If you connect the two terminals together, you should hear a click. If it clicks, the coil is good and your relay is working. If it doesn't click, your relay is bad.
How do you check the power on a fuel pump relay?
Connect your ground connection on the power supply to the ground pin on the relay. Touch the power supply's hot lead to the input pin. The relay will close, and you should get continuity between the two pins that the meter is connected to. You should also hear a clicking noise coming from the fuel pump relay.