Question about 1999 Pontiac Grand Prix

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I had a fuel pump put on two days after my engine light is on. Got diagnostic test done was told its fume vapors.triggering engine . What is this is it do to new fuel pump not placed on properly

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  • Pontiac Master
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If the fuel system isnt sealed or has a leak the check eng light will come on, so lets say they forgot to connect a line from tank to evap canister this would cause check engine light to come on, this happens no big thing as long as they repaired it at no charge. and the answer to your question is yes it can be because they didnt do the job correctly.

Posted on Aug 20, 2010

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Evap emmission,control sys leak


Do not top off your gas tank. The gas is going into carbon canister which is only for fuel vapors to go into (carbon canister opening near the top of fuel neck near the gas cap). Your flooding the fuel vapor canister with liquid fuel; of course you are going to get a sensor message... 'Evap emmission,control sys leak

P0443 The fuel vapor canister reduces that gas smell on hot days outside/inside of car. The fuel vapor canister fillers bad smells from gas tank on hot days when the gas expands and burps fumes through carbon canister filter. From the canister (gas vapor fumes) goes back into the engine to be burned again...it's a closed loop for vapors to be recycled though engine. Don't worry, once the carbon canister dries out and no longer flooded with raw fuel the code should go away...just don't let the top off fuel tank back flow into the 'Evap emission control' carbon filter near the top and close to the gas cap...:)

Apr 20, 2014 | 2000 Ford Mustang

1 Answer

Strong gas fumes outside of car


Possibly the vent line that routs fuel vapors from the gas tank to the charcoal canister has come loose. Check the hoses and lines around the fuel tank for leaks. There will be a fuel feed line to engine, a fuel return line from engine, and the evap. line or hose that carries the fuel vapors.

Apr 11, 2014 | 1995 Toyota Corolla

1 Answer

I am doind my question again. I have a 2004 Dodge Dakota pickup. The check engine light is on and the code is PO442 for a small vapor leak. I have had a smoke test done and I have replace 3 gas caps. After...


Trouble Code: P0442

EVAP System Small Leak Detected

Possible Causes:


EVAP fuel tank or canister vapor hoses leaking or damagedEVAP system component leaking, damaged or has failedFuel tank cap is loose, or the cap release pressure is incorrectLeak detection pump damaged or leaking.Also check the fuel filter for leaks.Does canister have filter on bottom?

Dec 24, 2012 | Cars & Trucks

1 Answer

Gas pump shuts off while filling tank constantly


like answer number 2 up there, California has a Fume Collector over the nozzle, and extends over the hose itself.... its really important NOT to "top it off" after the nozzle shuts off automatically.... it has a tendancy to fill up that vapor space with gas, and you can try to put gas in your car, but it stops each time you pull the "trigger" on the handle (acts like the tank is full) The service station person needs to come out and drain out the excess gas from the hose vapor space. (they are quite familiar with this.... it happens a lot)

Jan 27, 2012 | 2003 Subaru Baja

1 Answer

Service engine light is on....had checked and I'm told that I need to have my Fuel pressure sensor checked or changed...how can I be sure???


What was the fault code that triggered the engine light? The fuel pressure sensor on the Escalade monitors vapor pressure within the fuel tank to determine whether a leak has occurred and sends the information to the EVAP system to recirculate the fuel vapor.

Aug 21, 2011 | 2002 Cadillac Escalade Ext

3 Answers

I have 2000 ford contour my engine light came on i took my car and got a reading which said failed canister vent solenoid. what does that mean. Is it serious


The solenoid is for an emissions device called an evaporative loss canister. It would probably not affect how the engine performs but it would have to be replaced to pass a smog test.

Apr 29, 2011 | 2000 Ford Contour

1 Answer

My mom's 1995 Taurus has a fuel gauge that sporadically drops to below empty then after driving for awhile goes back to where it should be, a check engine light that stays on all of the time, and other...


possible fuel sending unit for the gauge check engine light try putting on a new gas cap.. sounds funny but if its the original and its bad it will trigger the check engine light wow i cant believe they told u to use a differnt gas b/s hope i helped good luck

Jan 22, 2011 | 1995 Ford Taurus

1 Answer

Fix engie light code p0442 Evaporative Emission Control, small leak detected


OBD II Code P0442 Evaporative System Malfunction, Small Leak Our emissions expert has put together the following information about the P0442 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
Related Information Check Engine Light
Emission Gas Definitions

OBD II Fault Code
  • OBD II P0442
Fault Code Definition
  • Evaporative System Malfunction, Small Leak
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0442 Code
  • Defective or damaged fuel cap
  • Distorted or damaged Fuel Tank Filler Neck
  • Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister
  • Defective Fuel Tank Sending Unit gasket or seal
  • Small split in a seam of the Carbon Canister
  • Defective Evaporative Vent Valve and/or Evaporative Purge Valve
  • Defective or damaged Fuel Tank
  • Defective Fuel Tank Pressure Sensor
  • Defective Leak Detection Pump
  • Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Basics
The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process.
Want to Learn More?
The EVAP system is designed not only to capture, store, and purge any raw fuel vapors that leak from areas in the Fuel Storage system, but also to run a series of self-tests that confirm or deny the operational and vapor holding ability of the system. This is an important task because at least 20 percent of vehicle-produced air pollution originates from malfunctioning Vehicle Fuel Storage systems.
There are many ways to "leak test" the EVAP system, but most perform the leak test when the vehicle is sitting (like over night) or during the initial start-up after the vehicle has been sitting over night. The EVAP system's operational performance is also tracked by the Power Train Computer by reading the change in the oxygen sensor voltages and short term fuel trim whenever the stored vapors are released or "purged" back into the combustion process. These values should indicate that fuel is being added to the system and that the overall mixture is getting richer. The purging process occurs when the vehicle is under acceleration, which is when most vehicles require additional fuel.

P0442 Diagnostic Theory for Shops and Technicians
The P0442 code indicates that there is a small leak in the EVAP system, but this is somewhat misleading. What the code really indicates is that the EVAP system will not hold a specified level of vacuum for a specified amount of time when it performs its leak test.
Here is how the evaporative leak test is performed by the Power Train Computer:
  1. When the leak test is performed, the vehicle must have been sitting for at least four to eight hours so that the engine temperature and outside air temperature are identical. There must also be between 15 and 85 percent fuel in the tank-this is to provide a baseline for the test since gasoline and diesel are volatile fluids that expand and vaporize easily with warm temperatures.
  2. When the leak test initiates, the Vapor Canister Vent Valve is closed to prevent any fresh air from entering the EVAP system. The Purge Valve is also sealed off.
  3. The Leak Detection Pump operates to build a vacuum in the entire Evaporative System (see the Leak Detection Pump information below). After a specified time interval-usually about ten seconds-the Purge Valve is shut off and the vacuum level in the system is measured by the Fuel Tank Pressure Sensor.
  4. Finally, a countdown initiates, which measures the rate at which the vacuum decays in the system. If the vacuum decays faster than the specified rate on two successive tests, then the Power Train Computer will fail the EVAP system and trigger the P0442 code. Most modern EVAP systems will fail the leak test with a pin-sized hole anywhere in the EVAP system, which amounts to 0.020 of an inch or a ½ millimeter.

Nov 26, 2010 | 2003 GMC Envoy

1 Answer

Fuel Odor on a 1998 Jeep Grand Cherokee


The evap system ( fuel vapor recovery system ) , if there is a leaky hose, can let fumes out that can be detected in the cab. If you "top off" the fuel at the pump you can spill fuel into the charcoal canister meant for fuel vapors only. the vapor recovery system is behind the left rear tire.

Usually if there is a hose leak a check engine light will come on.

If you TOP OFF, don't. If you don't, good. Hope this helps.

Apr 02, 2009 | 1998 Jeep Grand Cherokee

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