GM 13502903 Sensor Assembly, Fuel Tank Pressure

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The EVAP system in a car is desigend to trap and hold fuel vapor from the fuel tank and intake manifold. It comprises a canister filled with charcoal and several lines that connect it to the throttle body, the fuel tank, and the atmosphere. Typically, this canister is positioned under the vehicle near the fuel filter. Fuel vapors are collected when an engine is off from different parts such as intake manifold, throttle body and fuel tank they are stored at the canister. In case of operation of the engine these fuels are pushed out of canister into combustion by an airflow during purge process via charcoal. The purge valve solenoid which is used to open or close a mechanically actuated valve called a purge valve, was present on some older models; its place among other components has been standardized on today's vehicles. Rarely does EVAP system fail but old vehicles may have leaks causing loss of fuel vapour hence leading to environmental concerns alongside wastage of oil products. Obvious signs of malfunctions include smells of gasoline along with bad idle wether stalling or reduced drivability that could be accounted for by problems related to purging valves gone wrong, broken tanks, cracked hoses or wrong hose connections. There may be difficulties with finding leaks because there is so much tubing and ducting in this system but look underneath the vehicle might reveal obvious problems like leaking tubes therefore if you cannot find where they coming from then it would be better for you to get a professional pressure test done on your system. If diagnosed diagnosis , components in question including EVAP canister purge valve, EVAP vent valve, evaporation (EVAP) canister or fuel tank pressure sensor etc., most times that replacement can usually be carried out by following relevant procedures for removing & installing them at home though sometimes requires experts in repair works only.

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.

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.

The Evaporative Emissions Control (EVAP) system is a system designed to prevent the escape of fuel system vapors containing unburned hydrocarbons into the atmosphere. On hot days, fuel vapors that are trapped in the fuel tank continue to expand until they reach a certain pressure limit. The liquid fuels expelled from this tank move through the evaporative valve and canister, where they temporarily collect before being burnt up in an operating engine. There are times when the Powertrain Control Module (PCM) opens up the canister purge solenoid when suitable conditions are met like; warmed up engine, vehicle is at speed or there's a moderate to heavy load on the engine. This allows fuel vapour in the canister to be drawn into the intake manifold chamber for mixing with air/fuel mixture before it gets used in the combustion chambers. Both component and layout of EVAP system are critical including EVAP canister located above fuel tank consisting of activated carbon to hold vapours, fuel tank pressure sensor atop of fuel pump/fuel level sensor module and EVAP canister vent solenoid behind left rear wheel well fender liner which normally is opened but seals off for inspection/maintenance on EVAP system. It should be noted that with its duty cycle dependent on factors like vacuum in intake manifolds and data from sensors, vapor flow from canister to intake manifold is regulated by EVAP canister purge solenoid under PCM control. With all these advantages it must be remembered that troubleshooting an EVAP system requires specialized tools and training because these problems cannot be detected by ordinary people using normal senses, although some symptoms may be indicative of related problems. These include smelling gasoline on warm days primarily caused by loose or broken EVAP hose connections among other things. One method consists of removing the gas cap and listening for pressure release as signs of too much vaporized petrol within tanks, while professionals need full diagnostic test. The replacement of the EVAP canister purge solenoid on V6 engines requires removal of electrical connections, lines, and a mounting bolt for installation or reinstallation procedures since it is lodged at the left front part of the intake manifold. On the other hand, in case of V8 engines, you have to remove an engine cover to access the EVAP canister purge valve that is located at the top of rear intake manifold portion prior to disconnecting electrical connector and lines for removal and installation purposes. The EVAP canister vent solenoid located behind the left rear wheel well can be accessed by jacking up and securing the vehicle; disconnecting all electrical connectors, hoses then slide solenoid upward to remove or reinstall it. Finally, raising the vehicle disconnecting labeled hoses with electrical connectors then detaching it from its mounting bracket completes EVAP canister situated on top fuel tank's installation process. Above all, fuel tank pressure sensor atop fuel pump/fuel level sensor module mounting flange needs a raised motorcar body coupled with removal of fuel tank before eventually dismantling and reinstalling sensor by means of undoing electric plug.

The evaporative emissions control (EVAP) system of fuel has various parts including the canister, purge valve, vent valve, fuel tank pressure sensor, fuel tank and vapor and purge lines. The system functions by soaking up petrol fumes from the fuel tank as well as discharging them to the engine inlet during engine operation. The vapors are absorbed by the canister which is filled with activated charcoal; they are then drawn into the intake manifold and combustion chamber through purge hose under intake manifold vacuum. The PCM modulates the flow of vapors by regulating duty cycle on EVAP purge valve control solenoid. At cold start, the system does a self-diagnostic test with PCM monitoring fuel tank pressure sensor voltage for any leakages. There are step-by-step instructions provided to replace EVAP canister, purge valve, vent valve and fuel tank pressure sensor for each of these components.

To replace the fuel pressure sensor, relieve the fuel system pressure, lift the vehicle onto jackstands, and disconnect the sensor's electrical connector. Unscrew the old sensor, discard its o-ring, and fit a new oiled o-ring onto the new sensor. Reinstall in reverse order, ensuring the sensor is tight. Before lowering, test for leaks by toggling the ignition switch to ON for two seconds, OFF for ten seconds, and back to ON, checking for any leaks around the sensor. For the fuel pump driver module, elevate the vehicle, disconnect its electrical connector, remove three mounting bolts, and extract the module. Reverse the process to install.

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.

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 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.

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

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.

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