Fuel Tank Pressure Sensor: 99 Corvette Sensor Location Guide

The fuel tank pressure sensor in a 1999 Chevrolet Corvette is located in the fuel tank. The sensor measures the difference between the pressure or vacuum in the fuel tank and the outside air pressure. To replace the sensor, you will need to remove the right-rear wheel, the inner fender splash shield, and the EVAP canister cover. You will also need to disconnect the electrical connector from the sensor and carefully pry the sensor out of the fuel tank. When installing the new sensor, apply a small amount of engine oil to the grommet before placing the sensor into the top of the fuel tank.

The sensor is mounted in the fuel tank-sending unit

The fuel tank pressure sensor on a 1999 Corvette is mounted in the fuel tank-sending unit. This is located at the top of the fuel tank. The sensor is an essential component of the vehicle's Evaporative Emissions System (EVAP). It measures the difference in pressure or vacuum between the fuel tank and the outside air pressure.

The sensor is easy to access and remove. First, remove the right rear wheelhouse panel. Then, remove the EVAP canister access cover. Disconnect the electrical connector from the sensor and carefully pry the sensor out of the fuel tank with a screwdriver. When installing a new sensor, lubricate the rubber grommet with clean engine oil to aid installation.

It measures the difference between tank pressure and outside air pressure

The fuel tank pressure sensor is an integral part of a vehicle's evaporative emissions system, also known as EVAP. This system is designed to capture and contain gasoline or fuel vapors within the fuel system, preventing their escape into the atmosphere.

The fuel tank pressure sensor is typically mounted on top of or inside the fuel tank. Its primary function is to measure and monitor the pressure inside the fuel tank. Specifically, it measures the difference between the pressure or vacuum in the fuel tank and the outside air pressure. This pressure differential measurement is crucial for detecting any evaporative leaks in the system.

By comparing the pressure within the fuel tank to the outside air pressure, the sensor can identify abnormal pressure changes that may indicate leaks. These leaks could be due to a loose or faulty gas cap, or other issues within the EVAP system. The sensor's ability to detect these pressure differentials ensures that fuel vapors are contained and do not escape into the atmosphere, contributing to environmental concerns.

The sensor is connected to the engine computer or the Engine Control Module (ECM), and it transmits the pressure data it collects. If the sensor detects abnormal pressure readings or a potential leak, it signals the engine computer, which then triggers the ""check engine" light on the dashboard. This warning light alerts the driver to a potential issue and prompts them to seek mechanical assistance.

In a 99 Corvette, the fuel tank pressure sensor is located on top of the fuel tank-sending unit. It provides a signal voltage to the Powertrain Control Module (PCM) that varies between 0.1 and 4.9 volts. As the fuel tank pressure increases, the sensor voltage decreases, and as the pressure decreases, the voltage increases, creating a direct relationship between the pressure and voltage readings.

The PCM provides a 5-volt reference and a ground to the FTP sensor

The fuel tank pressure (FTP) sensor is an essential component of the vehicle's Evaporative Emissions System (EVAP). The FTP sensor is located in the top of the fuel tank-sending unit. The Powertrain Control Module (PCM) provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the PCM that can vary between 0.1 and 4.9 volts.

As fuel tank pressure increases, the FTP sensor voltage decreases. Conversely, as fuel tank pressure decreases, FTP voltage increases. The PCM utilises this data to monitor the pressure or vacuum in the fuel tank relative to the outside air pressure. This aids in the detection of evaporative leaks, such as a loose or faulty gas cap, ensuring the vehicle maintains efficient and environmentally friendly operation.

The FTP sensor is a solid-state device, and any attempts to measure resistance across its pins can result in sensor damage. Therefore, it is crucial to refer to the factory service manual for specific instructions when working with this component.

The FTP sensor provides a signal voltage back to the PCM

The Fuel Tank Pressure (FTP) sensor is an essential component of a vehicle's Evaporative Emissions Control (EVAP) system. It plays a pivotal role in maintaining the vehicle's emission levels by accurately reading the pressure within the fuel system. The FTP sensor is located at the top of the fuel tank-sending unit.

The PCM, or Powertrain Control Module, is responsible for controlling various aspects of the engine's performance and operation. By receiving the signal voltage from the FTP sensor, the PCM can adjust the air-fuel mixture and ignition timing accordingly. This ensures that the engine runs efficiently and that the fuel system is functioning properly.

In the event of a malfunction or issue with the FTP sensor, it will send an error signal to the PCM. This will trigger the Check Engine Light to illuminate on the dashboard, indicating that there may be a problem with the vehicle's fuel system or EVAP system. It is important to have a qualified mechanic diagnose the vehicle to identify the underlying cause of the problem accurately.

The FTP sensor's role in providing accurate information to the PCM is crucial for maintaining optimal engine performance and fuel efficiency. By measuring the difference between the pressure or vacuum in the fuel tank and the outside air pressure, the FTP sensor ensures that the PCM can make the necessary adjustments to keep the vehicle running smoothly.

To replace the sensor, remove the right-rear wheel, the inner fender splash shield, and the EVAP canister cover

To replace the sensor, you will need to first relieve the fuel tank pressure. Start by removing the fuel tank filler cap. Next, relieve the fuel system pressure. Then, loosen the lug nuts on the right-rear wheel and raise the rear of the vehicle, supporting it securely on jack stands. It is important to block the front wheels to prevent the vehicle from rolling.

Now, you can remove the right-rear wheel. After that, remove the inner fender splash shield and the EVAP canister cover. With these components out of the way, you will be able to access the fuel tank pressure sensor.

The next step is to disconnect the electrical connector from the sensor. Be careful when prying the sensor from its grommet, as you do not want to cause any damage. Once the sensor is removed, you can install the new one. Apply a small amount of engine oil to the grommet before installing the new fuel pressure sensor. This will help with the installation process.

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