I'm getting a lot of fuel vapor fumes inside the car. How do I know if its the solenoid? Will a bad solenoid effect gas mileage?

Your car has a small purge valve called a purge solenoid that controls the venting of fumes from the fuel tank as these fumes build up inside, particularly when you are refueling the car with gas. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. ... Normally the vent valve is open.

It sits on a bracket. In the center of the bracket use a small screw driver to bend the center piece out away from the valve. Then work the valve off of it. Pull it up to see it. Unplug it and remove the purge lines.

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...:)

Well it could be numerous if things but you want suggestions...So here's mine..Your gas tank might be vapor locked...This is caused from over filling your gas tank with gas over the years..Its when the pressure in your gas tank becomes greater than your fuel pump. It wont start until the pressure in your gas tank becomes lower then you fuel pump...Sounds crazy...This got me once...I didn't understand it...A lot of people (including me) Go to the gas station and get that extra 50 cent after the gas nozzle clicks off...over time that extra gas will run down the vapor lines intended to burn fumes....Like when you fill a gas can to cut your grass...If you sake the gas can it builds pressure and bows up. But with time that pressure will go away...Well saying that...Your gas tank needs to vent to....So your car burns not only gas but fumes...If you keep over filling your car with the extra gas it cloggs up your vapor canister intended for fumes or vapors...The gas will will go into that canister and clogg up the charcoal that's inside it. (Breaks it down) then the vapors can't get to your carburetor where it supposed to burns it. So what happens is the pressure in the gas tank becomes greater than your fuel pump and then car won't start..Are you with me? Lol Its crazy..Putting a different gas cap can cause the same thing...Simple test...When you open your gas cap to get gas.. Do you heat air sucking in.. Yes you can hear it....A lot of times loosening the cap let's the pressure out and the car will start right up.....Thus might not be your problem but worth telling at the gas pumps to other people..... Just trying to help

There is no solenoid in your gas tank. It's either a bad purge or vent solenoid, a leak in a vacuum line or a leak in the charcoal canister. GM has experienced lots of problems with the vent valve and tubing plugging up and staying open. That causes the engine to suck in too much air and kill your gas mileage. Start by testing/checking the vent solenoid

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.

I guess this is the line between the inlet manifold and the purge valve. The effect on gas mileage will be negligible. However the break in this line will open up a leak to air into the inlet manifold and this will make the engine idle badly. Best to repair, if not at least seal the ends of the break. As a temporary measure a bit of duct tape works well as there is not a great deal of pressure or vacuum on this line. Note that the purge valve normally remains closed until the engine is warmed up and is doing about 3000rpm.

CHECK EVAP SYSTEM CHECK EVAP CHARCOAL CANISTER COULD BE GAS SOAKED. OR THE PURGE CONTROL SOLENOID NOT WORKING.ITS NOT CONTROLING FUEL VAPORS FROM CANISTER TO INTAKE MANIFOLD.

in the EVAP system
it is possible that the fuel has got into the cannister and you are smelling the fumes from the vent

if that was the code for the purge vent solenoid i would say it is bad since you smell fumes. because that solenoid allows the vacuume from the engine while it is running to pull the excess fumes from the fuel tank and burn them off inside the engine. also might want to check lines under the hood associated with the solenoid to make sure excess air pressure from the fumes building up didn't blow a vac. line off. i would also check the condition of your fuel cap, if it doesn't seal good it could also cause a similar problem.