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Fuel tank pressure sensor wiring - 1998 GMC Jimmy

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Replacing a fuel tank pressure sensor. Is this different than the fuel regulator on the fuel pump?

Fuel tank pressure sensor is a sensor that is on my vehicle and I would assume on all vehicles on the fuel tank itself. Fuel tanks build up pressure (lots of pressure sometimes) They must have a way to vent this pressure so manufactures install fuel tank pressure valves and wire a sensor to it and hook it up to the on board computer. On my Mercury marquis it is impossible to replace my sensor without first removing the fuel tank. So to answer your ? yes the fuel pump regulator is different than the fuel tank pressure sensor. If you need help positively locating where it is go to and create an account (free) and enter your yr/mk/model and there you can go to repair help and view online Chiltons repair manuals. Good Luck!

Nov 03, 2015 | Cars & Trucks

2 Answers

Where is the fuel tank pressure sensor 0n a 2000 cavalier

I have never heard of a Fuel tank pressure sensor.. The fuel pressure comes from the Fuel pump which is in the fuel tank.. The pressure is regulated (Fuel Pressure Regulator) on the fuel rail on the engine near the fuel injector/s. The code PO254 is a generic code.. could mean different things.. Does it seem to be impacting how the car is running?

May 19, 2014 | 2000 Chevrolet Cavalier

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My 2001 saturn is trying to turn over and start but wont check engine light code p0452

P0452 Saturn Fuel Tank Pressure Sensor Circuit Low Voltage
"P0452 - Evaporative Emission Control System Pressure Sensor Low Input. Evaporative Emission Control System Pressure Sensor Low Input indicates a low voltage problem in the Fuel Tankicon1.png Pressure Sensor (FTPS). What the fuel FTP sensor does is convert fuel tank absolute pressure into electrical signals and inputs the signal to the ECM/PCM, (Computer).
First thing to do is make sure the gas cap is good and tightened properly. Then check the vacuumicon1.png lines and wiring at the FTPS (Location-Fuel Tank) to be sure they are good, clean and tight.
Barring a wiringicon1.png problem it can be a bad FTPS or PCM.
I copied this blog on the code p0452. So, check gas cap, check vacuum lines from fuel tank and trace the lines making sure there is no break. check wire plug on the fuel tank pressure sensor.

May 16, 2014 | Cars & Trucks

1 Answer

Fuel tank pressure sensor

fuel pressure sensor wire color is : black for ground, grey for 5 volt reference, and dark green for signal, then all wire coming from PCM


Sep 26, 2013 | 2009 Chevrolet Cobalt

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Where is the fuel pressure sensor located on 2000 GMC Sierra p/up 5.3

They didn't have a fuel pressure sensor in 2000.... are you referring to the fuel tank pressure sensor? That sensor measures the vacuum/pressure in the fuel tank and is related to evaporative emission control. That sensor is externally located directly on top of the fuel pump on top of the fuel tank. It has a 3-wire connector plugged into it.

Sep 01, 2013 | 2000 GMC Sierra

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Could it be that the ecu is wrong

No it is not Catalytic Converter related. Your fuel tank pressure sensor must be disconnected or the wiring to it defective for the evaporative emission system.
P0453 HONDA - Fuel Tank Pressure Sensor High Voltagexicon.jpg CodePossible causes- Fuel Tank Pressure sensor harness is open or shorted
- Fuel Tank Pressure sensor circuit poor electrical connection
- Fuel Tank Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?A high voltage signal from the fuel tank pressure sensor is sent to Engine Control Module (ECM).
P0450 - Evaporative Emission Control System Pressure Sensor Malfunctionxicon.jpg CodePossible causes- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?- An improper voltage signal from EVAP control system pressure sensor is sent to ECM.

Aug 10, 2012 | 1998 Honda Civic

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What does code PO452 mean? truck was hesitating and then quit running will crank but not run-computer code was PO452

DTC P0452 - FTP (Fuel Tank Pressure) sensor circuit low voltage
The Powertrain Control Module (PCM) monitors the Fuel Tank Pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the enhanced Evaporative Emission (EVAP) diagnostic. The PCM supplies a 5-volt reference and ground to the sensor. The FTP sensor signal voltage increases when the fuel tank pressure decreases. Negative pressure or vacuum indicates high voltage. The FTP sensor signal voltage decreases when the fuel tank pressure increases. Positive pressure indicates low voltage. This DTC sets when the FTP sensor signal goes below a predetermined value.

Circuit Description
The Fuel Tank Pressure Sensor responds to changes in the fuel tank pressure or vacuum. This information is used in order to detect vacuum decay or an excessive vacuum during the EVAP diagnostic routing. The fuel tank pressure sensor signal voltage to the VCM varies from a minimum of about 0.1 volts with pressure in the fuel tank to above 4.0 volts with a high vacuum in the fuel tank.

The Fuel Tank Pressure sensor display on the scan tool has an auto zero feature which occurs at each ignition cycle and is corrected according to the barometric pressure. Because of this, the Fuel Tank Pressure sensor display may not accurately reflect the actual output of the sensor or the conditions within the fuel tank.

The Fuel Tank Pressure Sensor diagnosis table is intended to isolate and diagnose the electrical problems with the sensor wiring or the sensor.

Conditions for Running the DTC
The ignition switch is in the RUN position.

Conditions for Setting the DTC
The fuel tank pressure sensor voltage is less than 0.1 volt for more than 5 seconds.

Action Taken When the DTC Sets
The VCM turns ON the MIL after 2 consecutive driving cycles with the fault active.

Conditions for Clearing the MIL/DTC
* The Control Module turns OFF the MIL after X trips when the test has Run and Passed.
* A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
* Use the scan tool Clear Information function.

Diagnostic Aids
1. Inspect the Control Module harness connectors for the following conditions:
* Improper mating
* Broken locks
* Improperly formed
* Damaged terminals

2. Inspect the wiring harness for damage. If the harness appears to be OK, observe the Fuel Tank Pressure sensor display on the scan tool while moving the connectors and the wiring harnesses related to the sensor. A change in the display will indicate the location of the fault.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.


If the VCM recognizes the high signal voltage, the VCM and the wiring are fine.

Good luck.

Oct 05, 2011 | Cars & Trucks

1 Answer

What is a p0452 code for a 2005 Chevy trail blazer

DTC P0452 - Fuel tank pressure sensor- low voltage.----------

Possible causes:------Faulty fuel tank pressure sensor.

  • open/short in wiring harness between pressure sensor & VCM.
  • Faulty VCM.
The fuel pressure sensor has to be checked and replace.-----------Thanks.Helpmech.

Feb 01, 2011 | 2005 Chevrolet TrailBlazer

2 Answers

I have a 1998 saturn sl1 with a code PO452 how do i fix it


Apr 18, 2010 | 1998 Saturn SL

1 Answer

PO452 code!

Try this sight and follow the directions.

Random misfire could mean you need a tune up. If you are at 100000 miles put in good X.C platinum plugs and a/c Delco wires.. Do a good fuel injection cleaning.

Hope this helps.

Aug 20, 2009 | 2001 Chevrolet Blazer

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