I'm smelling gas fumes inside the car when I'm idling but as soon as I accelerate it goes away

run fault codes
indicates a problem EVAP system

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...:)

Firstly stop driving your car until fixed !! You may have a cracked fuel line or split fuel line. Your problem seems worse at lights because you are stationary with no air flow through your car to blow the fumes away. It is dangerous to drive as it is. All you need is a spark from a cigarette etc. Any doubt get it towed to a garage .

Gasoline smell Ford Ricks Free Auto Repair Advice

gas is a very high evaporative liquid..fumes extremely strong..if overfull it will smell..and if emissions equipment has issues it will smell also.. when the engine gets hot, any gas present will vent off until the engine cools..thats the fuels evaporative nature..still keep an eye out for issues..

Could be several things including a leaking fuel pressure regulator or a faulty O2 sensor.
Is the check engine light on ?

The most common problem for this is the fuel filter or dirty spark plugs. If it is the plugs you would have a slight miss when idleing or be able to smell gas fumes from exhaust. Also your gas mileage would go down. The fuel filter will cause the vehicle to feel like it will stall and die when you try to accelerate or raise the rpm's in idle. I hope this helps. If you try both and it does not help try pulling the trouble codes and having them checked.

you may have a fuel line leak or loose fitting not hard to telljust get it up off the ground and check under car

You changed everything but the temperature sending unit/sensor. That's what is your problem as far as no proper cold start. When first started and cold, the sensor tells the computer to place the engine into cold start mode, engine starts and runs because it's at a bit higher idle and getting a bit more fuel. When warmed up, the sensor, if good, will tell the computer to place the engine into normal run mode now. Have the sensor tested first. If good, the engine is not going into a higher idle and is still getting the fuel but not using it fast enough because it's flooding. Hence the fuel smell. That's the fast idle solenoid on the EFI for this and the A/C high idle when it's running.

see if this link helps you out..
Heavy gas vapor smell inside of my chrysler 300m Google Search