SAFETY FIRST!
* Disconnect the negative battery terminal: This is crucial to prevent sparks that could ignite fuel vapors.
* Work in a well-ventilated area: Fuel vapors are heavier than air and can accumulate in low-lying areas.
* Avoid sparks or open flames: No smoking, welding, or anything that could create a spark.
* Use appropriate safety glasses and gloves: Protect yourself from potential fuel spills and sharp parts.
Tools You'll Likely Need:
* Socket wrench set (metric)
* Ratchet and extensions
* Torque wrench (to tighten the sensor to the correct specification – consult your repair manual)
* Fuel line disconnect tool (may be needed, depending on the type of connectors)
* Shop rags or absorbent towels
* Safety glasses
* Gloves
* New FTPS (make sure you get the correct one for your specific Blazer model and engine)
* Possibly a fuel pressure gauge (to check for leaks after installation – recommended)
Steps:
1. Locate the Fuel Tank Pressure Sensor: The location varies slightly depending on the engine and trim level, but it's typically located on the fuel rail or near the fuel pump module, often accessible through a small access panel under the rear passenger seat or in the cargo area. Consult your vehicle's repair manual or a reliable online diagram for the precise location.
2. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the FTPS. Take a picture or make a note of how it connects to make reassembly easier.
3. Disconnect the Fuel Line(s): If the sensor has fuel lines connected to it (some do, some don't), carefully disconnect them. Use a fuel line disconnect tool to prevent damage. Have absorbent rags ready to catch any spilled fuel.
4. Remove the Sensor: Carefully remove the sensor using the appropriate socket. It might be a bit stubborn due to corrosion, so use penetrating oil if needed. Be gentle to avoid stripping the threads.
5. Install the New Sensor: Apply a thin layer of anti-seize compound (optional, but recommended) to the threads of the new sensor. Carefully thread the new sensor into place, tightening it to the manufacturer's specified torque. Do not overtighten.
6. Reconnect the Fuel Line(s): Carefully reconnect the fuel lines, ensuring they are securely attached.
7. Reconnect the Electrical Connector: Plug the electrical connector back onto the new sensor.
8. Test for Leaks: Start the vehicle and check for any fuel leaks around the sensor. If possible, use a fuel pressure gauge to check the fuel system pressure and ensure it's within the manufacturer's specification.
9. Reconnect the Battery Terminal: Once you've confirmed no leaks and the system seems to be functioning correctly, reconnect the negative battery terminal.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 Chevy Blazer is highly recommended. It will provide detailed diagrams, torque specifications, and other important information.
* Professional Help: If you're not comfortable working with fuel systems or you're unsure about any step, it's best to take your Blazer to a qualified mechanic. Working with fuel is dangerous and improper handling can lead to serious injury or damage.
This is a general guide. The specific steps may vary slightly depending on your Blazer's configuration. Always refer to a repair manual for your specific vehicle before attempting this repair. Remember safety is paramount when working with fuel systems.
