Symptoms of a Bad or Failing Fuel Pump Relay

The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump. The fuel pump relay is usually controlled by the ignition or Powertrain Control Module, and when switched on, will provide current to the fuel pump so that it may function. As the fuel pump relay controls power to the fuel pump, any faults with it can cause issues with the fuel pump, which can cause drivability problems for the vehicle. Usually a bad or failing fuel pump relay will produce a few symptoms that can alert the driver of the issues.

1. Engine stalls

One of the first symptoms of an issue with the fuel pump relay is an engine that suddenly stalls. If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall. A faulty relay may allow the vehicle to be restarted a short while later, while a completely failed relay will not.

2. Engine does not start

Another symptom of a faulty fuel pump relay is an engine that does not start. If the fuel pump relay fails the fuel pump will be left without power. The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel. This symptom can also be caused by a wide variety of other issues, so having the vehicle properly diagnosed is highly recommended.

3. No noise from the fuel pump

Another symptom that may hint at an issue with the fuel pump relay is no noise from the fuel pump when the key is switched on. Most fuel pumps will produce a low volume hum or whine which can be heard from the inside the vehicle if listened for closely, or from the outside of the vehicle, near the fuel tank. If the fuel pump relay fails, it will cut off power to the fuel pump which will render it inoperable, and therefore silent, when the ignition is on.

While the fuel pump relay is a very simple component, it plays a very important role in the proper operation of the vehicle. If your vehicle is displaying any of the symptoms above, or you suspect that your fuel pump relay is having an an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced.


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Johnny

33 years of experience
264 reviews
Johnny
33 years of experience
Toyota Corolla L4-1.6L - Fuel System Inspection - Sacramento, California
Johnny did a great job

Arturo

27 years of experience
303 reviews
Arturo
27 years of experience
Nissan Titan V8-5.6L - Fuel System Inspection - La Mesa, California
Informative and efficient

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Chevrolet Impala V6-3.4L - Fuel System - Las Vegas, Nevada
Raymond was very knowledgeable mechanic and through in his testing. I trust him for any future from your mechanic.

Kenneth

20 years of experience
775 reviews
Kenneth
20 years of experience
BMW X5 L6-3.0L - Fuel System - Rancho Palos Verdes, California
Kenneth was extremely knowledgeable. He correctly diagnosed my vehicle by actually going under the hood, removing a section and running some sort of test that told him exactly what the problem was. He also arrived 15 minutes early and had prepared for the visit by contacting me the day prior to get further clarification.

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