Question about 2000 Chevrolet Blazer

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Fuel tank pressure sensor

Where is this located. My vehicle won't start anymore-----and some one had us replace the map sensor---but that wasn't it. the diagnostic checkout said it was the fuel sensor.

thanks for any help

Charlotte

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  • Anonymous Mar 18, 2014

    location of fuel tank pressure sensor

  • Anonymous Mar 25, 2014

    evap code needs replacing

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Located on top of fuel tank on the fuel pump. Check fuel pressure at the fuel rail first.

Posted on Nov 03, 2008

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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 Autozone.com 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!

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the evaporative emission system (EVAP) control system pressure sensor has sent high voltage to the ecm or engine control module and triggered this code either the purge valve located under the car by the gas tank has gone bad, or the charcoal canister has become gas soaked and is pressurizing from gas fumes, or the sensor or wires have shorted , there is also a secondary valve located und the cover of the intake that should also be checked for shorts that can trigger this code but usually it is the one under the car that goes out 9 out of 10 times it is from fuel being burped into the evap canister or charcoal canister from the gas tank which is caused from overfilling the tank or mid day heat of 90 or better with a full tank

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Where is the fuel pressure sensor located on a 2002 GMC Sierra 1500 4X4?


The fuel tank pressure sensor on a 1999 GMC Sierra is located on the top of the fuel tank on the fuel pump itself. Most say that you need to drop the fuel tank to replace it but if you have access to a lift you can replace it without removing the fuel tank. By removing the rear U joint straps and moving the driveshaft to the side you can see and access the sensor for replacement. Chock wheels to prevent movement of the vehicle after driveshaft is disconnected.

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You might have a defective fuel tank pressure sensor!

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99 buick regal supercharge starts fine in the morning but after accelerating cuts off


You have a MAF and MAP, The mass air flow signal varies with engine load.It is attatched to throttle body. This if it is the primary signal can cause the problem you desribe try and disconnect it and see if it idles properly. The next item you need to inspect is the MAP ,manifold air pressure this is a back up for the MAF sensor.If this sensor fails you will not accelerate correctly and stall out flooding the vehicle with fuel. This monitor the MAF and your EGR. If the EGR valve is stuck open the vehicle stumble and stall out and affect the performance of the MAF and MAP.Make sure your MAP is connected and the vacuum hose is attatch this item is located at top rear engine compartment near fuel injectors

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Welcome to FIxYa.com


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1 Answer

Fuel pump not getting power


This is general information:
If your timing belt is broke the computer will shut the fuel pump off, as well as a low-oil pressure sensor (check your oil level).

If you have a bad Crank-shaft sensor this will happen.
A bad MAP sensor will not let the vehicle start but if you remove the electrical plug from it, it should start but will be rough.
A bad cam-sensor should only make it hard on fuel.
Inspect the wiring that leads directly to the tank - you may have broken a corroded wire, especially where it goes back into the body from the gas-tank back.
Try giving the tank a whack with a rubber hammer or chunk of wood as someone turns the key off and on to start position without actually turning the car over this will dislodge any dirt that may have got lodged into the fuel pump.

The computer or ECM:  Inspect the harness at this location for movement and rubbing of the harness causing wires to fray and or break at this location up to a couple feet of the ECM perhaps.

I don't think you could have mixed up the return line to the tank from the feel line.  The computer will shut it off if the pressure isn't reached within 2 seconds.  

Without knowing more info on to what led to this problem, why you changed anything or what was the original problem and conditions, noises.
Sometimes there is a seal that seals the fuel pump to the sending unit and if this o-ring isn't put back in, you'll **** air but I don't think that this is your problem.  I suspect the MAP or Crank Sensor.
I wouldn't replace anything without testing them though, and if you purchase a manual from Canadian Tire in Canada, it will tell you how to test each Sensor.
Most electrical I recommend taking to a garage and have them put it on the computer for $90. and then to replace the part that they put in the quote.
Good luck

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1 Answer

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are you getting continuous spark? bad electronic module? check spark first. should be continuous. do you have oil pressure...some vehicles won't run if oil pressure is not there.

Jul 12, 2009 | 1997 Pontiac Sunfire

1 Answer

My vehicle just shuts off while im diving, it pulled codes p0453


They might be refering to the MAP Sensor. A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.
Contents How the MAP value is used The manifold absolute pressure measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. (See stoichiometric.) The mass of air is proportional to the air density, which is proportional to the absolute pressure and inversely proportional to the absolute temperature. (See ideal gas law.) Engine speed determines the frequency, or rate, at which air mass is leaving the intake manifold and entering the cylinders.
(Engine Mass Airflow Rate) ˜ RPM × (Air Density) or equivalently (Engine Mass Airflow Rate) ˜ RPM × MAP / (absolute temperature) They could also be refering to the fuel pressure sensor. If so, then yes this also can cause the problem. You shoud have your fuel pressure checked for about $34.00. If you have a bad fuel pressure regulator you will need to change it out. If it remains undelt with then it could take out your fuel pump. Most fuel pumps are located and installed in the top of your fuel tank and are submerged into your tank. It needs the fuel to keep it cool, but if you continually keep your fuel under 1/4 of a tank you will drastically reduce the life of your fuel pump. Fuel pumps can be expensive to replace. I replaced my wifes in her 1997 Chevy Blazer and it cost me $350.00 (lifetime warrenty). If you keep your gas under a 1/4 of a tank most of the time and your pump is found to b bad then you need to opt for the LIFETIME replacement pump. You only want to have to pay for the pump once, believe me. Otherwise you really haven't provided enough of the symptoms to go on. Does it shut off when you are at speed, or stall when at a stop? If it stalls when you come to a stop you could have bad Oxygen sensor(s). If it's the oxygen sensor(s) then you should replace all of them.

These are merely suggestions.
Good Luck!

Mar 14, 2009 | 2001 Oldsmobile Bravada

1 Answer

94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve


Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

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