The fuel pump is a crucial component of any vehicle’s engine system. It is responsible for pumping fuel from the gas tank to the engine, enabling the vehicle to run. In a Chevy Blazer, the fuel pump wiring diagram can be a little complex, but it is important to know the basics to ensure your vehicle runs smoothly. This article will provide a comprehensive guide to the 1999 Chevy Blazer fuel pump wiring diagram.
Understanding the Fuel Pump Wiring Diagram
Before delving into the Chevy Blazer fuel pump wiring diagram, it is important to understand the basics of wiring diagrams. A wiring diagram is a visual representation of the electrical system of a vehicle. It shows how each electrical component is connected to one another and to the battery or power source.
The Blazer fuel pump wiring diagram consists of various components, including the fuel pump relay, fuel pump assembly, fuel gauge sending unit, wiring harness, and connector. Each component is essential in ensuring that the fuel pump operates properly.
The Fuel Pump Relay
The fuel pump relay is responsible for regulating the power to the fuel pump. It is controlled by the powertrain control module (PCM) and is located in the engine compartment. The fuel pump relay receives power from the PCM and sends it to the fuel pump assembly.
The Blazer fuel pump relay is typically located inside the engine compartment, near the battery. It is identifiable by its rectangular shape and four-prong connector.
Fuel Pump Assembly
The fuel pump assembly is responsible for pumping fuel from the gas tank to the engine. It consists of the fuel pump motor, pump housing, and fuel level sensor. The Blazer fuel pump assembly is located in the gas tank and can be accessed by removing the tank.
Fuel Gauge Sending Unit
The fuel gauge sending unit is responsible for sending the fuel level information to the fuel gauge on the dashboard. It is integrated with the fuel pump assembly and is located inside the gas tank.
Wiring Harness and Connector
The wiring harness and connector are responsible for connecting the fuel pump relay, fuel pump assembly, and fuel gauge sending unit to the battery or power source. The harness and connector are made up of wires and connectors that are color-coded for easy identification.
How to Read the Chevy Blazer Fuel Pump Wiring Diagram
Reading the Blazer fuel pump wiring diagram can be daunting, but it is essential to understand how the wiring operates to troubleshoot any issues. The diagram consists of various symbols that represent different electrical components.
The symbols used in the Blazer fuel pump wiring diagram include the fuel pump relay, fuel pump assembly, fuel gauge sending unit, wiring harness, and connector. Each symbol is labeled with a letter or number that corresponds to the color-coded wires in the wiring harness and connector.
Frequently Asked Questions (FAQ)
1. How do I troubleshoot a fuel pump issue on my Chevy Blazer?
If you suspect that your Blazer’s fuel pump is not working, there are a few steps you can take to troubleshoot the issue. First, check the fuse and relay to ensure they are working properly. You can also test the fuel pump by listening for a humming noise while turning the ignition key. If there is no humming noise, the fuel pump may need to be replaced.
2. How do I replace the fuel pump on my Chevy Blazer?
To replace the fuel pump on your Blazer, you will first need to remove the gas tank. This can be done by disconnecting the fuel lines and electrical connections, and then using a jack to lower the tank. Once the tank is removed, the fuel pump assembly can be accessed and replaced.
3. Can I replace the fuel pump relay myself?
Yes, the fuel pump relay can be replaced by a novice mechanic with basic tools. The relay can be found inside the engine compartment and is typically located near the battery. Simply unplug the old relay and replace it with a new one.
Conclusion
The 1999 Chevy Blazer fuel pump wiring diagram may seem complex, but it is important to know the basics to ensure your vehicle runs smoothly. Understanding the various components, symbols, and wiring harnesses can help you troubleshoot any issues and keep your Blazer running for years to come.
