GM 13502903 Sensor Assembly, Fuel Tank Pressure

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After relieving the fuel system pressure, you need to remove the intake manifold.

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.

Remove the fuel tank filler cap.

Next, relieve the fuel system pressure and wait for at least two hours before proceeding.

To replace the fuel pressure sensor, first relieve the system fuel pressure. Then, raise the vehicle and support it securely on jackstands. Disconnect the electrical connector from the fuel pressure sensor by depressing the release tab. To remove the sensor from the fuel supply line, hold the flats on the fuel line with a wrench to prevent twisting the line, then unscrew the 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 by turning the ignition switch key to the ON position (don't start the engine) for two seconds, then to the OFF position for ten seconds, then back to the ON position.

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.

Remove the engine covers. Relieve the fuel system pressure. Disconnect the cable from the negative battery terminal. Remove the intake manifold and the fuel pump/fuel rail insulator. The fuel rail fuel pressure sensor is located at the rear of the left-side fuel rail. Disconnect the fuel pressure sensor electrical connector. Unscrew and remove the sensor from the end of the fuel rail. Clean the threads in the fuel rail of any gasoline. Apply a single drop of oil on the new sensor threads, then install the sensor and hand tighten it. Remove the sensor, apply another drop of clean engine oil on the threads, then reinstall the sensor and tighten it. Connect the sensor electrical connector. The remaining installation steps are the reverse of the removal process. Remove the low-pressure fuel feed line bracket bolt and disconnect the feed line at the pump. Using a flare-nut wrench, unscrew the high-pressure line fittings between the fuel rail and fuel pump and discard the pipe as a new one must be used. Disconnect the electrical connector from the high-pressure fuel pump. Remove the high-pressure fuel pump bolts, then remove the cover, pump, and gasket. Always replace the bolts and pump gasket with new ones. With the pump removed, rotate the engine by hand and ensure that the camshaft lobe is at its base circle (lowest point) before attempting to install the pump. Lubricate the pump roller with engine oil. Using a NEW gasket, position the pump and cover onto the valley cover and tighten the bolts evenly, one turn at a time, from side to side. Tighten the bolts. The remaining installation steps are the reverse of the removal process. Clean the high-pressure fuel line fittings on the pump and crossover pipe, then apply a drop of clean engine oil to the threads of each fitting. Install the NEW high-pressure fuel line, tightening the fittings to the torque specified in the Specifications. The remaining installation steps are the reverse of the removal procedure. Reconnect the cable to the negative battery terminal, then start the engine and check for fuel leaks.

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

V6 engines for 2012 and later model have the fuel pressure sensor either mounted on a hitting on the fuel tank or directly on the fuel tank with no hitting.

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

The PCM cycles the EVAP purge valve control solenoid on and off to optimize the purge based on engine conditions.

To relieve 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. Don't forget to block the front wheels to prevent the vehicle from rolling. Remove the right-rear wheel, as well as the inner fender splash shield and EVAP canister cover. Disconnect the electrical connector from the sensor and carefully pry the sensor from its grommet. To complete the installation, apply a small amount of engine oil to the grommet before installing the fuel pressure sensor.

To disconnect the electrical connector from the fuel pressure sensor, you simply need to unplug it.

After removing the engine covers, you should remove the intake manifold and the fuel pump/fuel rail insulator.

Start by removing the charge air cooler outlet hose. Disconnect the harness connector to the fuel rail and the harness connector from the camshaft position sensor. Unclip the wiring harness retainers and move the harness and connectors out of the way. Remove the sound insulator around the pump body. Unscrew the intermediate high-pressure line fittings between the fuel rail and fuel pump and remove the fuel line bracket bolt. Remove the wiring harness bracket mounting bolts and move the bracket out of the way. Disconnect the electrical connector from the high-pressure fuel pump and disconnect the low-pressure feed line quick-connector at the pump. Remove the low-pressure fuel feed line. Remove the high-pressure fuel pump bolts and remove the pump, gasket, and lifter follower. Lubricate the lifter follower with clean engine oil and install it into the bore in the cylinder head. Install the alignment gauge and rotate the engine until the gauge sits flush with the cylinder head. Remove the alignment gauge and, if necessary, the valve lifter follower. Lubricate the pump valve lifter follower with engine oil and insert it into the bore. Set the pump into position on the bore using a new O-ring gasket and tighten the bolts evenly. The remainder of the installation is the reverse of the removal process. Reconnect the cable to the negative battery remote terminal, start the engine, and check for fuel leaks.

The FRPS should be installed by reversing the removal steps.

The Evaporative Emissions Control (EVAP) system is designed to prevent the escape of fuel system vapors containing unburned hydrocarbons into the atmosphere. Fuel vapors trapped in the fuel tank expand on warm days until they reach a specific pressure threshold. At this point, the fuel vapors are directed from the fuel tank through the fuel vapor vent valve and the fuel vapor control valve to the EVAP canister, where they are temporarily stored until they can be consumed by the engine during normal operation. When conditions are suitable, such as when the engine is warmed up, the vehicle is at speed, or there's a moderate to heavy load on the engine, the Powertrain Control Module (PCM) opens the canister purge solenoid. This allows fuel vapors to be drawn from the canister into the intake manifold, where they mix with the air/fuel mixture before being used in the combustion chambers. The EVAP system consists of various components, including the EVAP canister located atop the fuel tank, which contains activated charcoal for vapor storage, the fuel tank pressure sensor on top of the fuel pump/fuel level sending unit module, and the EVAP canister vent solenoid situated behind the left rear wheel well fender liner, normally open but sealing off the EVAP system for inspections and maintenance. The EVAP canister purge solenoid, under PCM control, regulates vapor flow from the canister to the intake manifold, with its duty cycle determined by the PCM based on factors like intake manifold vacuum and sensor data. Troubleshooting the EVAP system requires specialized tools and training. Common symptoms of EVAP issues include fuel odors, particularly on hot days, often caused by loose or damaged EVAP hose connections. Checking for excessive fuel vapor pressure in the fuel tank involves removing the gas cap and listening for pressure release, while a full evaluation requires professional diagnostics. For component replacement, the EVAP canister purge solenoid on V6 engines is located at the left front of the intake manifold and requires disconnecting electrical connections, lines, and a mounting bolt for removal and reinstallation. On V8 engines, the EVAP canister purge valve sits on top of the rear intake manifold part, necessitating the removal of an engine cover, disconnecting the electrical connector, and lines for removal and installation. The EVAP canister vent solenoid, located behind the left rear wheel well, can be accessed by raising and securing the vehicle, disconnecting the electrical connector and hoses, and sliding the solenoid up to remove and reinstall it. Lastly, the EVAP canister, situated atop the fuel tank, requires raising the vehicle, disconnecting electrical connectors and labeled hoses, then detaching it from its mounting bracket for removal and installation. The fuel tank pressure sensor, located on top of the fuel pump/fuel level sensor module mounting flange, involves raising the vehicle, removing the fuel tank, disconnecting the electrical connector, and then removing and reinstalling the sensor.

To remove the fuel rail sensor, start by relieving the fuel system pressure and disconnecting the cable from the negative battery terminal.

The fuel evaporative emissions control (EVAP) system consists of several components, including the canister, purge valve, vent valve, fuel tank pressure sensor, fuel tank, and vapor and purge lines. The 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. The system performs a self-diagnostic check when the engine is started cold, and the PCM monitors the fuel tank pressure sensor voltage to detect any leaks. The EVAP canister, purge valve, vent valve, and fuel tank pressure sensor can be replaced by following specific steps for each component.

To install the sensor, simply reverse the removal steps and tighten it to the specified torque.

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.

Remove the fuel tank. Disconnect the electrical connector and pull the fuel tank pressure sensor from the fuel pump module.

Raise the vehicle and support it securely on jackstands. Remove the fuel tank. Disconnect the electrical connector from the canister vent solenoid valve. Disconnect the hoses from the canister, which is located on top of the fuel tank, at the rear. Remove the retainer securing the canister on top of the fuel tank and remove the canister.

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

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.

Start by disconnecting the cable from the negative battery terminal and removing the engine cover.

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

Component replacement procedures involve disconnecting quick-connect fittings, cleaning the area, and removing mounting bolts, hoses, and electrical connectors.

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.

This sensor is located on the top side of the tank