I have a problem with the Vent contol Valve. It is the filling the gas tank issue and the poor gas millage. It is not covered under my warranty. I know I could get the part from nissanpartsdirect.com for $165. I was wondering where on my vehicle(2005 Sentra) it would be and roughly how to change it. I was also thinking of trying to get the part from a junkyard. I personally would not be changing it(my fiance would be).
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The system not venting properly is usually the most common source of this issue. Check filler tube/vent tube for any restrictions. Also try keeping pump nozzle part way out of filler tube.If no restrictions found, possible defective tank vent valve on top of tank. Tank will usually have to be removed to access this valve
the vent control valve on the charcoal canister is clogged or stuck preventing the air to escape from the gas tank causing the gas to back up in the fill tube and shut off the pump. if this is the case your check engine light should be on... P1443 indicates a problem with the evap vent control solenoid valve. some auto part stores will get the codes from your vehicle for free and tell you what could be causing it. although you have to be careful some codes can be caused by one thing and be the cause for the code on another part. an example is your problem, a clogged vent hose from the gas tank to the vent solenoid can throw this code or it can be the valve itself.
Sally, the problem is the charcoal vent system. A new one will cost about $150.00 but......... the total fix will require the cleaning of the vent valve on the gas tank. You will find small pieces of the charcoal (pellet size) in the valve. You must look close to see them. Think pencil lead size. Remove them and exercise the valve some. The valve is a push in and out type. I don't understand the reason the charcoal pellets make their way to the vent valve at the tank but they do because I found them in mine. They must travel out of the canister and up and over a dry loop in the vent line to get to the vent valve at the gas tank. This would take some vacuum to cause the pellets to travel. It also requires the poor construction of the factory instaledl canister vent outlet because there is a filter at the canister that is supposed to contain the pellets. This will verify you have gotten all the charcoal pellets out. The charcoal canister (located up under the fender is easy to replace). You can make a cheep fix by installing some scaring pad material in the vent connection line at the canister but that doesn't address the charcoal being plugged. This will keep the charcoal pellets in the canister. You will have to drop the gas tank partially to remove and clean the vent valve. Keep in mind you are working on a gas system that is very dangerous. i.e. it doesn't like spark's. Only begin this job with a tank that is all but empty. You can find diagrams of the vent system on the internet. So you can identify the parts I have referred to here. I have done this work. It is not easy. It is an under the car and also through the car trunk operation. You will have to remove the gas pump via the trunk from the gas tank. Remember about the spark issue when you do this part of the job. This problem is very common with Hyundai's and several other cars. It is because the manufacture has reduced the gas fill piping to roughly a 3/4" pipe and installed a government requied venting system that you have this problem. You will see that at the tank the opening is as fill lines used to be about 2" and at the gas nozzle area also about 2'" but the rest of the line is no larger in diameter than the gas pump nozzle. That is not to place the blame all on the car manufacture. You see it is always the government that is behind our frustrations in life. The EPA has told the car companies that the gas vapors we used to smell when the car was being fueled are no longer aloud. So the need for the charcoal vent system to capture the vapors of the gas as fueling is being done. Some car people have said that if you never overfill your tank these fueling problems never happen. i.e. the charcoal in the canister never gets wet with liquid gas only vapors. Note the warning stickers and owners manual cautions to stop the filling process when the gas nozzle clicks off the first time. Sally you will know if you have not followed this advise and fueled your car clicking the nozzle several times after the first nozzle stop. That is the way we used to fuel the cars in the good old days. However, I do almost all of the gassing of my car and I had the problem. So I say the car manufacture is responsible for the issue with poor designs in the system. Lastly I can't stress enough the importance of not doing this job as a back yard mechanic operation because of the volatility of the gas. It can and will blow up if not handled correctly. Good luck!!!!
P0446 Evaporative Emission Control System Vent Control Circuit MalfunctionEvap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
SymptomsThere will be no obvious symptoms to driver, other than MIL illumination.
CausesA code P0446 could mean one or more of the following has happened:
Faulty vent valve
Open, short or excessive resistance on Vent valve control circuit
Blockage of vent valve
Possible SolutionsWith a P0446 OBD-II trouble code, here are some things to try:
Replace Vent valve
Repair open, short, or resistance problem in control circuit
Repair open, or short, or resistance problem in power circuit
When filling your tank, if the fill hose kicks off and/or gas kicks back up the tube it's an indication that the evaporative emissions vent tube is plugged, the cannister vent valve is not working correctly, or that there is a restriction in the fill pipe/hose. Unless the tank or pipe was recently worked on or part of an accident, you can eliminate it. I've found several concerns involing the vent tube and cannister vent valve. Spiders like to make webs inside of these items and the web blocks the air from escaping. When you fill your tank, the air inside needs to go somewhere. If it can't escape, it will cause the gas to back up and shut off the fill handle or kick gas back. There are ways to check this function with a scan tool and pressure machine but you can also do a visual inspection by disconnecting the valve and looking for webs or debris. You can also run water though the open line or blow shop air though to be sure it's clear. The P1450 is an evaporative emission code and is probably related to the filling concern but could also be a seperate issue. If the concern is not obvious, you will need to have an auto tech hook up a scan tool and perform a pressure test while monitoring the fuel tank pressure sensor. Basic diagnosis is 1.0 0 1.5 hours multiplied br the shops hourly rate. Ex: 1.5 hr. X $100.00 = $150.00 diag charge.
There may be a problem with your EVAP system.Dirt/dust can get into the system causing a poor fill condition.Replacement of EVAP canister and or vent solenoid may be required. The canister and vent solenoid are located near the gas tank on the passenger side under the vehicle.
Fuel fill limiter vent valve stuck closed
Evaporative emission (EVAP) canister restricted
EVAP vent valve stuck closed
Hose between canister and canister vent solenoid twisted or kinked if applicable
High fuel temperature
Fuel filler hose is kinked