No Power To Fuel Pump Relay Chevy Truck – What’s The Cause?

No power to fuel pump relay Chevy Truck? Don’t know what the reason is and how to fix it?

There are many reasons for not having electricity to fuel the fuel pump relay of the Chevy Truck. However, we need to check the two main parts, the power source, and the fuel pump. Let’s discuss the underlying causes in this article!

No Power To Fuel Pump Relay Chevy Truck – Caused By The Power Supply

The inoperable fuel pump may be due to the main cause of the power source because all relay operations receive signals from the power source to operate.

A Damaged Or Weak Battery

A car without electricity is a condition in which the vehicle’s battery is depleted, or the battery has no electricity. This condition causes your vehicle to not start, cannot operate, and cannot transmit signals to relays of components such as fuel pump, horn, warning, lights, etc. The drop in charge is the main cause of a damaged or weak vehicle battery.

When you have turned off the engine but some electronic devices are still using a small amount of electricity to maintain operation or to store information, the car will also need to use the battery.

One of the first reasons to mention that is because the driver forgot to turn off the lights or equipment using battery power such as ceiling lights, lighting or turn signals, air conditioning fan system, speaker system, etc.

Many drivers add a lot of entertainment or decoration equipment but forget about the capacity of the limited battery, reducing the life of the battery causing them to run out of power faster, and causing sudden power outages.

In addition, after a period of use, the terminals of the vehicle’s battery will be corroded or dirty, affecting the ability to conduct charging into the battery. Poorly connected terminals are also a common cause of cars not having electricity.

Failure to regularly check and maintain the vehicle, especially the car battery, will cause many drivers to have a situation where the car does not have electricity, so all activities on the vehicle are stopped, including the fuel pump.

Fuse And Related Problems

Vehicles that do not have electricity to pump fuel can also be caused by electrical system problems such as broken fuses, wires, and connections.

  • The fuse can blow leaving the vehicle without power
  • A faulty ignition circuit or damaged ignition switch will not be able to control power to many components, including the fuel pump and relay.
  • If there is a problem with the switch or circuit, you should check the wiring and connections. Because they can break, corrode due to time, temperature, longevity, or humidity.

Faulty Fuel Pump

After operating for a while, the fuel level in the tank will gradually decrease. If the fuel level is too low, the fuel pump will not be cooled sufficiently and will overheat, this can easily damage the fuel pump.

When overworked or contaminated, the fuel pump will not be sufficiently lubricated and cooled.

Thereby leading to the risk of the fuel pump unit overheating when the fuel level is too low, causing damage and malfunctions in operation. The performance of the fuel pump is also significantly reduced from contamination.

Therefore, you need to check the fuel pump system regularly to avoid an exhausted or clogged fuel filter due to dirt.


If there is no power to the fuel pump or relay, you should check for power problems first. Does your car run out of power or no electricity?

First, you should check the fuse, battery, connector, wiring, ignition circuit, ignition switch to ensure power on the vehicle. If your car is still powered on, it may be because the fuel pump relay is damaged and needs to be replaced.

If you have any questions or concerns, please leave a comment for us to get the most detailed answer.

2 thoughts on “No Power To Fuel Pump Relay Chevy Truck – What’s The Cause?”

  1. Chevy 2008 Silverado 1500, the electric plug to the power module for the fuel pump has a thin green o-ring seal on the plug to keep water out of the wiring.

    • Hi Gil,

      If you need a replacement O-ring seal for the electric plug on the power module for the fuel pump in your 2008 Chevy Silverado 1500, you have a few options:

      Dealership Parts Department: The most reliable source for obtaining specific and genuine replacement parts is often the dealership where you purchased the vehicle or any authorized Chevy dealership. You can contact their parts department and provide them with your vehicle’s information to ensure you get the correct O-ring.

      Automotive Parts Stores: Local automotive parts stores may carry a variety of O-rings, including ones that could fit your needs. Bring the old O-ring with you to compare sizes and find a suitable replacement.

      Online Retailers: You can also search for the O-ring online through various retailers, including those that specialize in auto parts. Online platforms such as Amazon, eBay, or dedicated auto parts websites may have replacement O-rings for your specific vehicle.

      When purchasing a replacement O-ring, make sure to verify that it is compatible with your Chevy Silverado’s fuel pump power module plug. Additionally, if you have any concerns about installation or compatibility, consult with your vehicle’s manual or seek advice from a professional mechanic.


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