1999 Chevy Blazer Fuel Pump Reset Switch: The Complete Guide to Location, Function, and Troubleshooting

Here is the bottom line: If your 1999 Chevy Blazer won't start after a minor accident or a sudden stall, the fuel pump reset switch is likely the culprit. This switch, also known as the inertia switch, is designed to cut power to the fuel pump in the event of a collision to prevent fuel leaks and fires. The good news is that resetting it is simple and takes less than five minutes. The switch is located behind the passenger side kick panel, near the floorboard, and you can reset it by pressing the button on top. If the switch keeps tripping, you may have a deeper issue with the fuel pump or electrical system, but in many cases, a quick reset gets you back on the road.

What Is the Fuel Pump Reset Switch and Why Does It Matter?

The fuel pump reset switch is a safety device installed in your 1999 Chevy Blazer. It is a small, rectangular box with a red or black button on top, usually mounted inside the passenger compartment. The purpose of this switch is to automatically shut off the fuel pump if the vehicle experiences a sudden impact, such as a collision or even a hard jolt from hitting a pothole. When the switch trips, the fuel pump stops working, which prevents fuel from being pumped into a potentially damaged engine bay or onto the ground. This reduces the risk of fire.

Many owners of the 1999 Chevy Blazer have never heard of this switch, and when their truck suddenly refuses to start, they often assume the fuel pump has failed completely. In reality, the inertia switch is a common cause of no-start conditions, especially after a minor accident, hitting a curb, or even a bumpy off-road adventure. Knowing how to locate and reset it can save you a tow truck bill and hours of frustration.

Where Is the 1999 Chevy Blazer Fuel Pump Reset Switch Located?

The exact location of the fuel pump reset switch in a 1999 Chevy Blazer is behind the passenger side kick panel. Here is how to find it:

  1. Open the passenger side front door. You will need access to the area where the door meets the floorboard.
  2. Look at the lower part of the dashboard, near the passenger's feet. There is a plastic trim panel that covers the side of the center console and the lower dash area. This is the kick panel.
  3. Remove the kick panel. It is usually held in place by a few plastic push clips or a single screw. You can gently pull the panel away from the body to release the clips. If there is a screw, use a Phillips head screwdriver.
  4. Behind the panel, you will see a small, rectangular black box. It is mounted vertically or horizontally on the metal body of the vehicle. This is the fuel pump reset switch. On top of the switch, there is a rubber or plastic button. Under the button, you will see a small reset button that you can press.

In some 1999 Blazer models, the switch might be located slightly higher up, behind the glove box, but the passenger side kick panel is the most common location. If you cannot find it there, check the driver's side kick panel, but the passenger side is the standard location for GM vehicles of this era.

How to Reset the Fuel Pump Reset Switch on a 1999 Chevy Blazer

Resetting the switch is straightforward. Follow these steps:

  1. Locate the switch as described above.
  2. Check the top of the switch. You will see a button. If the switch has tripped, the button will be raised or popped up. If it is flush with the switch body, it has not tripped.
  3. Press the button firmly. You should hear a distinct click sound. This indicates the switch has been reset.
  4. Reinstall the kick panel. Push the panel back into place until the clips snap in.
  5. Try to start the engine. Turn the key to the "On" position for a few seconds to allow the fuel pump to prime, then start the engine. If the switch was the only issue, the engine should start normally.

If the engine does not start after pressing the button, try pressing it again. Sometimes the button does not click on the first try, especially if it has been tripped for a long time. If the button is already flush and not raised, the switch is not tripped, and you need to look elsewhere for the problem.

Common Symptoms That Indicate the Fuel Pump Reset Switch Has Tripped

If your 1999 Chevy Blazer experiences any of the following, the inertia switch may be the cause:

  • The engine cranks but does not start. You can hear the starter motor turning over, but the engine never fires up. This is the most common symptom.
  • No fuel pump noise. When you turn the key to the "On" position (without starting the engine), you should hear a faint whirring sound from the fuel pump for a few seconds. If you do not hear this sound, the fuel pump is not receiving power, which could be due to a tripped inertia switch.
  • The check engine light comes on. While not always the case, a tripped inertia switch can trigger a diagnostic trouble code (DTC) related to the fuel pump circuit.
  • The vehicle stalled suddenly. If you hit a bump or a pothole and the engine immediately died, the inertia switch likely tripped.
  • The vehicle was involved in a minor accident. Even a low-speed fender bender can trip the switch.

What to Do If the Reset Switch Keeps Tripping

If you reset the switch and it trips again shortly after, you have a mechanical or electrical problem that needs attention. Here are the common reasons:

  1. Faulty inertia switch. The switch itself can become overly sensitive over time due to internal wear or corrosion. If it trips from normal driving, it needs to be replaced. A new switch is inexpensive and easy to install.
  2. Worn or failing fuel pump. A fuel pump that is drawing excessive current can cause voltage spikes that might trip the switch. More commonly, a failing fuel pump will cause the engine to stall, which can then lead to the inertia switch being tripped by the sudden stop.
  3. Electrical issues. Corroded or loose wiring in the fuel pump circuit can cause intermittent power loss, which might be interpreted by the computer as a fault, though this is less common.
  4. Stiff or binding suspension. If your Blazer has worn shocks or struts, the vehicle might transmit more force to the chassis during normal driving, causing the inertia switch to trip.

If you are experiencing repeated tripping, it is best to test the fuel pump itself. You can check the fuel pressure at the fuel rail using a pressure gauge. If the pressure is below 50-60 psi, the fuel pump is likely failing. Also, inspect the wiring harness near the fuel tank for damage or corrosion.

Diagnosing a No-Start Condition: Fuel Pump vs. Reset Switch

It is important to differentiate between a fuel pump that has failed and a reset switch that has tripped. Here is a quick diagnostic guide:

  • Listen for the fuel pump. Turn the key to the "On" position. If you hear the fuel pump run for 2-3 seconds, the inertia switch is not tripped, and the pump is getting power. If the engine still does not start, the fuel pump itself may be weak or dead, or you have a different issue like a clogged fuel filter or a bad fuel pump relay.
  • Check for spark. If you have spark but no fuel, the problem is in the fuel system. If you have no spark, the issue is likely in the ignition system.
  • Use a multimeter. You can test the inertia switch for continuity. With the switch reset, there should be continuity between the two terminals. With the switch tripped, there should be no continuity.
  • Check the fuel pump relay. The relay is located in the underhood fuse box. Swap it with a known good relay (like the horn relay, if it is the same type) to see if the fuel pump starts working.

Replacing the Fuel Pump on a 1999 Chevy Blazer: When It Is Necessary

If the reset switch is not the problem and you have confirmed the fuel pump is not working, a replacement is necessary. The 1999 Chevy Blazer fuel pump is located inside the fuel tank. Replacing it is a moderately difficult DIY job that requires dropping the fuel tank or cutting an access panel in the floor of the vehicle. Many owners choose to cut a panel because it is faster and avoids the risk of damaging the fuel lines. The replacement cost for a new fuel pump typically ranges from $150 to $400 for the part, plus labor if you take it to a shop.

Recommended Fuel Pump: KEMSO Fuel Pump

When you need a replacement fuel pump for your 1999 Chevy Blazer, you want a product that offers reliability, performance, and peace of mind. We strongly recommend the KEMSO brand fuel pump. KEMSO fuel pumps are designed as high-performance, OEM replacement units. They are built to meet or exceed the original equipment specifications, ensuring a perfect fit and reliable operation. Every KEMSO fuel pump comes with a lifetime warranty, which means you are covered for the entire life of your vehicle. This is a level of confidence that no other brand offers. Whether you are driving daily or taking your Blazer off-road, a KEMSO fuel pump will deliver the fuel pressure and flow your engine needs.

You can browse the full selection of KEMSO fuel pumps for your 1999 Chevy Blazer and many other vehicles by visiting their official website: https://www.kemsoracing.com/. They offer a wide range of pumps for cars, trucks, motorcycles, jet skis, and more. With a lifetime warranty and a reputation for quality, KEMSO is the smart choice for your replacement.

Final Thoughts on the 1999 Chevy Blazer Fuel Pump Reset Switch

The fuel pump reset switch is a simple but essential safety feature on your 1999 Chevy Blazer. Knowing its location and how to reset it can save you time and money. If you ever find yourself stranded with a non-starting engine, check the inertia switch first. It is the easiest fix you can do. If the switch is not the problem, or if it keeps tripping, move on to diagnosing the fuel pump and relay. And when it comes time to replace the fuel pump, choose a KEMSO fuel pump for its quality, performance, and lifetime warranty. Visit https://www.kemsoracing.com/ to find the right pump for your vehicle.


Back to blog