how to jump fuel pump relay on chevy truck

How to Jump Fuel Pump Relay on Chevy Truck

The fuel pump relay is a crucial component of a Chevy truck’s fuel system, responsible for regulating the electrical current to the fuel pump. However, there might be instances when the fuel pump relay malfunctions, causing your vehicle to have difficulty starting or stalling unexpectedly. In such situations, bypassing the fuel pump relay temporarily might be necessary to get your truck back on the road.

Is It Safe to Bypass a Fuel Pump Relay?

Before attempting to bypass the fuel pump relay, it is essential to understand the potential risks involved. Bypassing the relay can lead to electrical hazards and even fire if not done correctly. Additionally, it may impact other critical components in the vehicle’s electrical system, leading to costly damages.

Precautions Before Jumping the Fuel Pump Relay

Safety should always be the top priority when working with the vehicle’s electrical system. Before attempting to jump the fuel pump relay, make sure the vehicle is parked on a level surface and engage the parking brake. Disconnect the battery terminals to minimize the risk of electrical shock or short circuits.

Step-by-Step Guide on How to Jump Fuel Pump Relay on Chevy Truck

Locating the fuel pump relay: 

Open the hood and locate the fuse box or relay center in the engine compartment. The fuel pump relay is usually labeled and can be found among other relays in a black plastic box.

Identifying the correct relay: 

Refer to the vehicle’s manual or the diagram on the relay box cover to identify the fuel pump relay.

Tools required: 

You will need jumper cables and a wrench to perform the procedure.

  • Removing the fuel pump relay: Carefully remove the fuel pump relay from its socket in the relay box.

Properly connecting the jumper cables: 

Use the jumper cables to connect the appropriate relay pins. Be cautious not to cross-connect or short-circuit any wires.

Testing the Jumped Fuel Pump Relay

After properly connecting the jumper cables, reconnect the battery terminals. Start the engine and check if the fuel pump is operational. Observe for any unusual behavior or issues.

Diagnosing a Bad Fuel Pump Relay

If you suspect a bad fuel pump relay but are unsure, there are ways to diagnose it. Look for signs such as a check engine light, rough acceleration, stalling or idling engine, no noise from the fuel pump, or difficulty starting the engine. Using a multimeter, you can test the relay’s continuity to determine if it is malfunctioning.

Alternatives to Jumping the Fuel Pump Relay

While jumping the fuel pump relay can be a temporary solution, it is advisable to seek professional assistance for a thorough diagnosis. An alternative method is to use a fuse with the same rating as the fuel pump relay. This can help test the fuel pump without bypassing the relay.

Safety Measures and Best Practices

Jumping the fuel pump relay should only be attempted if you have sufficient knowledge and experience in working with electrical systems. Always prioritize safety and avoid taking shortcuts. It is essential to consult the vehicle’s manual and follow manufacturer recommendations.


Jumping the fuel pump relay on a Chevy truck can be a temporary solution to diagnose a potential issue with the fuel pump. However, it comes with risks and should only be attempted with caution and proper knowledge of electrical systems. If unsure, it is best to seek professional help for a thorough diagnosis and repair.

FAQs (Frequently Asked Questions)

Signs of a bad fuel pump relay include a check engine light, difficulty starting the engine, or the fuel pump not making any noise when turning the ignition.

Yes, a faulty fuel pump relay can lead to problems with the fuel pump’s operation, affecting the engine’s performance and causing stalling or rough acceleration.

Yes, it is possible to temporarily bypass the fuel pump relay to check the fuel pump’s functionality. However, it should be done with caution and safety measures in place.

If you have experience and knowledge in working with electrical systems, you can attempt to jump the fuel pump relay. Otherwise, it is best to seek professional assistance.

Bypassing the fuel pump relay without proper knowledge can lead to electrical hazards, fire risks, and potential damage to other critical components in the vehicle’s electrical system.

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