Replacing The Fuel Tank Sensor In Your 1999 Gmc Sierra

If the fuel gauge in your 1999 GMC Sierra is acting up, it may be time to replace the fuel tank sensor. This sensor is responsible for reading the fuel level in your tank and relaying that information to the gauge on your dashboard. While it is possible to just replace the sensor, it's worth considering replacing the entire fuel pump module as well, as the original may be nearing the end of its lifespan. You can attempt to fix the issue by adding a fuel system cleaner to your tank, but if that doesn't work, you'll need to replace the sensor or the entire module. Sensors can be purchased from a variety of retailers, including Amazon and Advance Auto Parts, and typically range in price from $10 to $90.

The fuel tank pressure sensor is located inside the fuel tank

If your GMC Sierra is showing incorrect fuel gauge readings, the fuel tank pressure sensor may need to be replaced. The fuel tank pressure sensor is located inside the fuel tank, mounted to the side of the fuel module assembly.

To replace the sensor, first purchase a suitable replacement part. You can find these online or at auto parts stores. The part number for the sensor is 16238399.

Once you have the new sensor, you will need to remove the old one. This will involve draining the fuel tank and removing the fuel pump module assembly. Be very careful when handling the fuel, as it is highly flammable. It is recommended to have a professional perform this step if you are not comfortable doing it yourself.

With the fuel tank empty and the assembly removed, you can now replace the sensor. Detach the old sensor from the assembly and attach the new one in its place, ensuring that all connections are secure. Reinstall the fuel pump module assembly and refill the fuel tank.

This should restore accurate fuel gauge readings in your GMC Sierra.

Note: This process may vary depending on the specific model and year of your GMC Sierra, so it is always a good idea to consult a repair manual or a professional mechanic for more detailed instructions.

The sensor measures fuel level changes, which are displayed on the vehicle's fuel gauge

If the fuel gauge on your 1999 GMC Sierra is not reading correctly, the most likely cause is a faulty fuel level sensor. This sensor is responsible for measuring the fuel level in your tank and relaying that information to the gauge on your dashboard.

To replace the fuel level sensor, you will need to purchase a new one that is compatible with your vehicle. You can find these at auto parts stores or online. Make sure to consult a mechanic or the manufacturer's instructions for your specific vehicle model to ensure you get the correct part.

Once you have the new sensor, the process of replacing it will involve the following steps:

• Locate the fuel pump module inside the fuel tank. The fuel level sensor is mounted to the side of this module.
• Remove the old sensor. This may involve disconnecting wiring harnesses and/or removing mounting hardware. Take note of how the sensor is attached so that you can install the new one correctly.
• Install the new fuel level sensor. Ensure that all connections are secure and that the sensor is mounted firmly in place.
• Test the fuel gauge to ensure that it is now reading correctly.

It is important to note that accessing the fuel pump module and fuel level sensor may require specialised tools and knowledge of automotive repair procedures. If you are uncomfortable performing this repair yourself, it is recommended that you consult a qualified mechanic.

Additionally, some people have reported success in temporarily fixing a faulty fuel level sensor by adding a bottle of Techron or a similar fuel additive to their tank. This may help to clean the sensor and improve the accuracy of the fuel gauge readings.

A faulty sensor can cause the fuel gauge to give incorrect readings

The fuel sending unit is composed of a float, a metal rod or arm, and a variable resistor. The float, made of buoyant composite or foam, floats on top of the fuel in the tank. The float is connected by a thin metal rod to a contact inside the variable resistor. The variable resistor then receives power from the vehicle's battery and sends an electric current to the fuel gauge, which displays the fuel level accordingly.

If something happens to the fuel sending unit, the fuel gauge may give incorrect readings or stop working altogether. For example, if the float becomes detached from the metal arm, the fuel sending unit may stop sending any information about the fuel level. Alternatively, a faulty variable resistor or corroded wires can disrupt the transmission of information, leading to incorrect fuel gauge readings.

To restore reliable fuel gauge readings, you can replace the fuel level sensor. This can be done at a fraction of the cost of replacing the entire Fuel Pump Assembly. Aftermarket products are available for the GMC Sierra 1999 that can be purchased online or at local auto parts stores. It is recommended to consult a professional mechanic or refer to the owner's manual for guidance on replacing the fuel level sensor.

The sensor can be replaced without needing to replace the entire fuel pump assembly

If you're looking to replace the fuel tank sensor in your 1999 GMC Sierra, you may be wondering if you need to replace the entire fuel pump assembly. The good news is that you can absolutely replace the sensor without needing to replace the whole assembly. This is a more cost-effective option and can be done by purchasing a fuel level sensor that mounts to the fuel delivery module.

There are a variety of options available for GMC Sierra 1500 fuel level sensors, and it's important to choose one that is compatible with your vehicle. Some popular options include the Dorman Fuel Level Sensor and Gasket (Part No. 911-013 or 911-023) and the ACDelco Fuel Level Sensor Kit with Seal (various part numbers depending on your specific vehicle). These sensors are designed to restore reliable fuel gauge readings and are a direct replacement for a proper fit. They include all the necessary gaskets for a complete repair.

When purchasing a fuel level sensor, it's important to buy from trusted brands that offer quality and reliability. Some recommended brands include AC Delco and Carquest Premium, which offer GM-recommended replacement parts that provide the same performance, durability, and service life as the original factory components.

Before purchasing and installing a new fuel level sensor, be sure to verify compatibility with your specific GMC Sierra model and year. Additionally, if you're uncomfortable with the repair process, consider consulting a professional mechanic or a trusted auto parts store for guidance.

There are aftermarket replacement sensors available for purchase online

If you're looking to replace the fuel tank sensor in your 1999 GMC Sierra, you'll be happy to know that there are indeed aftermarket replacement sensors available for purchase online. You can find these at stores like Amazon and Advance Auto Parts.

For example, Amazon offers a Garage-Pro Fuel Tank Pressure Sensor Replacement that fits the GMC Sierra 1500 1999-2008 4.8, 5.3, 5.7, 6.0, 6.2, and 6.5L engines with VIN: B. This sensor is a direct fit and comes with a 1-year warranty when purchased through Auto Parts Giant.

Advance Auto Parts also offers a range of fuel level sensors for the GMC Sierra 1500, with prices starting at $91.99. Their products include options from trusted brands like AC Delco and Carquest Premium.

When purchasing an aftermarket replacement sensor, it's important to ensure that it is compatible with your specific vehicle make, model, and year. Additionally, it's always a good idea to refer to the owner's manual or seek professional advice if you're unsure about the installation process.

Frequently asked questions