Chevrolet 16238399 Sensor,Fuel Tank Pressure

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Then, remove the intake manifold and the foam insulator.

To remove the sensor, you need to follow these steps.

Disconnect the electrical connector from the EVAP purge control solenoid valve, which is located on the top of the intake manifold, next to the throttle body.

Tighten the sensor.

The Evaporative Emission Control (EVAP) system in a vehicle is designed to capture and store fuel vapors from the fuel tank and intake manifold. This system includes a charcoal-filled canister and various connecting lines that link the canister to the fuel tank, throttle body, and outside air. The canister is typically located beneath the vehicle, adjacent to the fuel filter. Fuel vapors are collected from the fuel tank, throttle body, and intake manifold and stored in the canister during engine inactivity. When the engine operates, these stored vapors are purged from the canister by intake airflow and consumed during combustion. The purge valve solenoid, controlled by the Powertrain Control Module (PCM) and sometimes accompanied by a tank pressure sensor on newer models, is situated near the throttle body. While the EVAP system rarely fails, older vehicles may develop leaks, causing fuel vapors to escape and potentially leading to environmental issues and fuel wastage. Signs of a malfunction include a strong fuel odor, poor idle, stalling, or diminished driveability, often due to issues like a malfunctioning purge valve, damaged canister, cracked hoses, or incorrect hose connections. Detecting leaks can be challenging due to the system's complex tubing and connections, but a visual inspection under the vehicle can help identify visible problems, and if the source remains elusive, professional system pressure testing is recommended. If diagnosed, component replacement, such as the EVAP canister purge valve, EVAP vent valve, EVAP canister, or fuel tank pressure sensor, can usually be performed at home following the appropriate removal and installation procedures.

When the engine operates, the stored vapors are purged from the canister by intake airflow and consumed during combustion.

After removing the fuel pressure sensor, you should remove the old o-ring and replace it with a new one coated in clean engine oil.

The fuel evaporative emissions control (EVAP) system plays a crucial role in managing fuel vapors, absorbing them from the fuel tank and subsequently releasing them into the engine's intake system to mix with incoming air/fuel mixture. This system comprises key components, including the canister filled with activated charcoal for vapor absorption, the purge valve, the vent valve, the fuel tank pressure sensor, the fuel tank itself, and the vapor and purge lines, although the components may vary slightly across different years and applications. Fuel tank vapor, directed through a check valve, enters the charcoal canister via the vapor hose, where the activated charcoal stores the vapors. When specific conditions are met (e.g., engine running, reaching a preset temperature), the ECM/PCM opens both the purge valve and vent valve. Consequently, fuel vapors from the canister are drawn through the purge hose by intake manifold vacuum into the intake manifold and combustion chamber, where they are consumed during normal engine operation. The ECM/PCM controls the vapor flow rate from the canister to the intake manifold by modulating the EVAP purge valve control solenoid's duty cycle. In cold conditions and during a hot start time delay, the ECM/PCM keeps the solenoid de-energized. Once the engine warms up to the correct operating temperature, the ECM/PCM regulates vapor purging into the intake manifold based on the engine's running conditions. The ECM/PCM cycles the purge valve control solenoid (ON and OFF) approximately 5 to 10 times per second, adjusting the flow rate by varying the solenoid's energization time. OBD-II models (1996 through 2000) perform a self-diagnostic check during cold engine startup, wherein the PCM opens the EVAP canister purge valve and closes the vent valve, creating a vacuum in the entire EVAP system. Upon reaching the correct vacuum level, the PCM closes the purge valve to seal the system and monitors the fuel tank pressure sensor voltage, setting a diagnostic code if it detects a leak. These models also feature a fuel tank pressure sensor, similar in operation to a MAP sensor, returning a signal voltage to the PCM corresponding to the air pressure inside the fuel tank, allowing for leak detection. It's important to note that the EVAP system is protected by a federally-mandated warranty of 5 years or 50,000 miles. When troubleshooting the system, start by checking the hoses for damage, disconnection, or misrouting. Repair or replace hoses as needed. For early models without electronic purge controls, inspect the charcoal canister, purge control valve, and vacuum hoses for issues. On late models with electronic purge controls, verify related fuses and wiring integrity for the purge and vent valves. The purge and vent valves are typically closed, with vapor flow initiated by the PCM's solenoid activation. While some limited testing is possible, a scan tool is required for thorough examination. If these initial checks do not identify the problem, consult a dealer service department or qualified repair shop. When replacing components, late model EVAP system hoses are equipped with quick-connect fittings, requiring a twisting motion to loosen the seal before disconnection. The EVAP canister's location varies with the year and application, while removal involves disconnecting hoses and removing the bracket mounting bolt. The purge valve, located on the charcoal canister in early models or on the intake manifold in late models, requires disconnecting the electrical connector, depressing the locking tab to remove the hose, and removing the mounting nuts/bolt. The vent valve on 1996 through 2000 models is mounted on a bracket near the fuel tank, necessitating raising the vehicle, disconnecting the electrical connector, removing the hose, and releasing retainers to remove the vent valve from the bracket. The fuel tank pressure sensor on 1996 through 2000 models is situated on the fuel pump module, requiring fuel tank removal, disconnection of the electrical connector, and release of the retaining clip to remove the sensor from the fuel pump module. Installation for all replaced components follows the reverse of the removal procedure.

Loosen the lug nuts on the right-rear wheel and raise the rear of the vehicle, supporting it securely on jack stands.

The fuel evaporative emissions control (EVAP) system plays a vital role in managing fuel vapors from the fuel tank, releasing them into the engine intake system during engine operation. Key components include the canister, which contains activated charcoal to absorb fuel vapors, the purge valve, vent valve, fuel tank pressure sensor, fuel tank, and various vapor and purge lines. Fuel tank vapor, after passing through a check valve, is directed to the charcoal canister, where the charcoal absorbs and stores the vapors. The PCM (Powertrain Control Module) opens the purge and vent valves under specific conditions, allowing fuel vapors from the canister to be drawn into the intake manifold and combustion chamber for consumption. The PCM regulates the vapor flow rate through the EVAP purge valve control solenoid, cycling it on and off, optimizing purge based on engine conditions. During cold start-up, the system performs a self-diagnostic check, creating a vacuum in the EVAP system to detect leaks, and the PCM monitors the fuel tank pressure sensor voltage for potential issues. The fuel tank pressure sensor, similar to a MAP sensor, supplies a signal voltage to the PCM that corresponds to the air pressure within the fuel tank. Component replacement procedures involve disconnecting quick-connect fittings, cleaning the area, and removing mounting bolts, hoses, and electrical connectors. The EVAP canister, purge valve, vent valve, and fuel tank pressure sensor can be replaced following specific removal and installation steps. It's important to note that the evaporative emissions control system is protected by a federally-mandated warranty.

Relieve the fuel system pressure first. Then, disconnect the Fuel Pressure Sensor (FRPS) electrical connector. To prevent fuel from entering the generator during FRPS removal and to catch some of the fuel from the fuel rail when the sensor is removed, place a towel on top of the generator. Using a 27mm socket, and being careful not to damage the foam insulator, remove the sensor. Fuel will drain from the opening in the fuel rail where the sensor was attached. This fuel must be washed away and the area dried prior to starting the vehicle. Installation is the reverse of removal. Upon starting the vehicle, immediately inspect for fuel leaks.

The chassis control module is located under the vehicle, mounted to the outside of the driver's side frame rail.

To remove the engine covers, you need to relieve the fuel system pressure and disconnect the cable from the negative battery terminal.

Before removing the FRPS, you should place a towel on top of the generator to prevent fuel from entering it.

The EVAP system is designed to prevent the escape of fuel system vapors containing unburned hydrocarbons into the atmosphere.

The EVAP system works by absorbing fuel vapors from the fuel tank and releasing them into the engine intake system during engine operation. The canister, filled with activated charcoal, absorbs and stores the vapors, which are then drawn into the intake manifold and combustion chamber through the purge hose by intake manifold vacuum. The PCM regulates the rate of vapor flow by controlling the duty cycle of the EVAP purge valve control solenoid.

Then, remove the intake manifold and the foam insulator.

The valve sits on top of the rear intake manifold part, requiring the removal of an engine cover, disconnecting the electrical connector, and lines for removal and installation.

You should tighten the fuel pressure sensor securely.

Unscrew the bolt and remove the purge valve from the upper intake manifold.

Relieve the system fuel pressure to begin with the fuel pressure sensor. Raise the vehicle and place it securely on jackstands. Disconnect the electrical connector from the fuel pressure sensor. Unscrew the fuel pressure sensor from the fuel supply line. Remove and discard the old fuel pressure sensor o-ring. Coat a new o-ring with a little clean engine oil, then install it on the fuel pressure sensor. Installation is otherwise the reverse of removal. Be sure to tighten the fuel pressure sensor securely. Before lowering the vehicle, test for leaks as follows: Turn the ignition switch key to the ON position (don't start the engine) for two seconds. Turn the ignition switch key to the OFF position for ten seconds. Turn the ignition switch key to the ON position (don't start the engine). Inspect the area around the fuel pressure sensor for leaks. For the fuel pump driver module, raise the vehicle and place it securely on jackstands. Disconnect the electrical connector from the fuel pump driver module. Remove the three control module mounting bolts and remove the module from its mounting bracket. Installation is the reverse of removal.

The PCM (Powertrain Control Module) opens the purge and vent valves under specific conditions, allowing fuel vapors from the canister to be drawn into the intake manifold and combustion chamber for consumption.

The first step is to relieve the system fuel pressure and raise the vehicle on jackstands.

After raising the vehicle on jackstands, you should disconnect the electrical connector.

After removing the fuel pump flow control module, you should install the new module in the reverse order of removal.

The main factor that can cause this issue is a bad sensor, an electrical problem that could be coming from a loose wire or bad connection, or a bad sending unit

The fuel pressure sensor is usually located on top of the fuel tank