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Fuel tank will not vent when fueling ,what to do to replace vent?

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Buy a vent valve from the dealer 171.00 list . easy to change fixed my problem 

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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2001 Buick LeSabre 3.8 V6 Code P0449 , what needs Replaced?? Car will Not Start. Stalls and Dies. Supposed Fix: Vapor Canister Vent Solenoid; Exact Location & Replacement Procedure??


Malfunction 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. The carbon canister, which stores the raw fuel vapors, utilizes a vent valve that allows fresh air to enter the EVAP system. This displaces the fuel vapor as it's purged into the combustion process. Code P0449 indicates that the evaporative control (EVAP) system vent valve solenoid is malfunctioning. This can be caused by either too little or too much electrical resistance or a mechanical problem with the vent valve itself. P0449 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 P0449 Code
  • Missing fuel cap
  • Defective Evaporative Vent Valve
  • Defective or damaged fuel cap
  • Distorted, damaged or cracked Fuel Tank Filler Neck
  • Torn or punctured Evaporative system hose(s)
  • Defective Fuel Tank Sending Unit gasket or seal
  • Split or damaged Carbon Canister
  • Defective or damaged fuel tank
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Polluting Gases Expelled
  • HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog

Jun 05, 2018 | 2001 Buick LeSabre

1 Answer

Is it crtical that fuel cap makes an airtight seal on this car Nissan Micra 2004 Petrol


I'm not an auto mechanic - Can't speak for every car or fuel cap, but in general there must be a vent for the fuel tank either thru a vent built into the cap or separately. A fuel tank with no vent will build a vacuum as fuel is pumped out to the engine and eventually the fuel pump will stop pumping if unable to overcome the vacuum or if powerful enough, the vacuum will cause the fuel tank to collapse. Air must enter somehow! Possibly cars these days have a filter/absorbent on a d dedictated vent to remove potential dust and moisture, but none of my cars ever had a fuel vent filter replaced. My guess is that an airtight seal is not critical on any gas or diesel tank cap.

Mar 12, 2016 | Nissan Cars & Trucks

2 Answers

How do I remove a fuel tank from a 2004 Buick Rendezvous


First of all, there is a recall for gas tank replacement for your vehicle. The dealer will replace it free. The link will get you to the document in PDF form
Redirect Notice
It looks like there is a bracket on one end of the tank hidden by a heat shield
0601244b03-002.jpg
FUEL SUPPLY SYSTEM Fits Buick Rendezvous

Feb 08, 2015 | 2004 Buick Rendezvous

1 Answer

Fuel pressure problems. If I remove the fuel cap truck runs normal. I've replace just about everything. And still have problems with it.


Have you actually checked the fuel pressure with and without the gas cap? If you have a tank venting (EVAP) system problem (e.g. blocked vent on gas cap, plugged canister, or one of the two vent valves stuck shut), you can draw too high a vacuum on the tank which will cause a fuel starvation problem.

Dec 02, 2017 | 1995 Chevrolet C/K 2500

2 Answers

Removal of gas tank


Fuel Tank Assembly Removal & Installation Single Tank To Remove:
  1. Before servicing the vehicle refer to the precautions at the beginning of this section
  2. Relieve fuel system pressure (See: Fuel System Relieving)
  3. Disconnect the negative battery cable
  4. Raise and support the vehicle
  5. Drain the fuel tank in an approved container
  6. Remove or disconnect the following:
    • evaporative emission (EVAP) canister Disconnect fuel lines for single tank gm_trk_sub15_fuel_line_rem_singl_tnk.gif

    • Chassis fuel lines (B) at the fuel tank (A)
      1. Cap the fuel and EVAP lines to prevent possible fuel system contamination
      Disconnect EVAP vent line gm_trk_sub15_evap_vent_line_rem.gif

    • EVAP vent line at the fuel tank clip (E) Disconnect vent hose and filler hose gm_trk_sub15_vent_filler_hoses.gif

    • Vent hose and filler hose clamp (D, B)
    • Vent hose and filler hose from the line
    Fuel tank removal gm_trk_sub15_fuel_tank_rem.gif

  7. With the aid of an assistant or a suitable jack support the fuel tank
  8. Remove or disconnect the following:
    • Fuel tank strap attaching bolts
    • Fuel tank straps
  9. Carefully lower the rear of the fuel tank slightly
  10. Remove or disconnect the following:
    • Fuel sender cover Fuel tank connections gm_trk_sub15_fuel_tank_conn.gif

    • Fuel sender and the fuel pressure sensor electrical connectors
    • Fuel tank
  11. Place the fuel tank in a suitable work area Fuel lines at the tank gm_trk_sub15_fuel_lines_at_tank.gif

  12. Remove or disconnect the following:
    • Fuel feed and return lines (C) from the fuel sender and the retaining clips
    • Fuel pump assembly from the fuel tank
    • EVAP line from the fuel tank roll over valves (B, D) and the retaining clips (A)
    • Fuel fill hose and the vent hose from the fuel tank
    • Fuel tank
To Install:
  1. Install or connect the following:
    • EVAP line to the fuel tank roll over valves and the retaining clips
    • Fuel pump assembly to the fuel tank
    • Fuel feed and return lines to the fuel sender and the retaining clips
    • Fuel fill hose and the vent hose to the fuel tank; torque hose clamps,
      1. Torque to: 22 lb-in. (2.5 Nm)
  2. With the aid of an assistant or a suitable jack support and partially raise the fuel tank front end first
  3. Install or connect the following:
    • Fuel sender and the fuel pressure sensor electrical connectors
    • Fuel sender cover
  4. Fully raise the fuel tank
  5. Install or connect the following:
    • Fuel tank straps
    • Install the fuel tank strap attaching bolts;
      1. Torque to 30 lb-ft. (40 Nm)
    • Fuel fill hose and the vent hose to the lines;
      1. Torque hose clamp to 22 lb-in. (2.5 Nm)
  6. Torque the vent hose clamp,
    • Torque to: 22 lb-in. (2.5 Nm)
  7. Connect the EVAP vent line to the fuel tank clip
  8. Remove the caps from the fuel and EVAP lines
  9. Install or connect the following:
    • chassis fuel lines at the fuel tank
    • EVAP canister
  10. Lower the vehicle to the ground
  11. Fill the fuel tank with clean fuel
  12. Install the fuel filler cap
  13. Connect the negative battery cable
  14. Use the following procedure to inspect for leaks:
    • Turn the ignition on for two seconds
    • Turn the ignition off for 10 seconds
    • Turn the ignition on
    • Inspect for fuel leaks
  15. Install the engine sight shield
  16. Road test the vehicle to check performance

Feb 12, 2011 | 2000 GMC Sierra

2 Answers

How do I replace the Fuel Pump in my 2002 Cadillac Seville SLS


Hello ray......

The fuel pump is located inside the fuel tank. You can access the fuel tank thru the trunk. Inside the trunk and underneath the carpet, there is a access panel. Remove the five screws and lift the access panel. There under the panel you will see the pump. Disconnect it and take it to the auto parts store as they usually want the old one for an exchange. Joe


Thanks for choosing Fixya!

Dec 16, 2010 | Cadillac Seville Cars & Trucks

2 Answers

Gas gauge reading empty even when tank is full


Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve fuel system pressure.
  3. Drain the fuel tank.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Fuel filler and vent hoses
    • Fuel tank skid plate
    • Fuel tank wiring connectors
    • Fuel supply and return lines
    • Fuel tank
    • Fuel pump assembly
      7924bg17.gif Fuel pump assembly mounting
To install:
  1. Install or connect the following:
    • Fuel pump assembly
    • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
    • Fuel supply and return lines
    • Fuel tank wiring connectors
    • Fuel tank skid plate
    • Fuel filler and vent hoses
    • Negative battery cable
  2. Start the engine and check for leaks.

Apr 16, 2009 | 2002 Isuzu Axiom

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