If the fuel filler neck dosent seem to be damage or have loose connections,but if you touch the rubber part of it an ash kind of black substance is left on your hands.could it be leaking through this

I looked up fuel tank filler neck in online parts book. At the gas cap, is there three screws holding the top part of filler neck? If so, remove the screws. Lower part of filler neck, where it attaches to fuel tank, is there a hose with hose clamp? Take the hose clamp loose. Do you have to safely raise and support the vehicle in order to remove filler neck? W/o being able to look at it, I don't know? good luck

1)Block front wheels.
2)Jack up the left rear tire off of the ground.
3)Put blocks up under the frame.
4)Take off the left rear tire.
5)Take out the plastic liner in the fender well that covers the fuel filler neck.
6)Loosen up the hose clamps on the rubber fuel filler hoses. (at the neck side); once the clamps are off plan on buying new ones. This next part of the job is VERY IMPORTANT! use a flat screwdriver and pry 360 degrees all around the rubber filler neck hoses. (they get kinda glued on from being on there so long). Next Get some PB Blaster lube or WD-40 (it has to have the small red squirt hose) and spray the lube up in between the hoses while you pry around. the more you do this the easyer it will be to pull the metal filler neck pipe out.
7)Now its time to take out the 4 bolts that hold the pipe on.
Use a 10mm socket and extension to take out 4 bolts up top behind the fuel filler door.
8)Pull the filler neck out and put everything back together the way it came apart and your done!

to start with you have to remove the filler neck at the tank opening you open the doorthere will be three small Torx head screws surrounding the perimeter of the opening for the fuel tank filler remove those 3 screws allowing a filler neck to wobble inside the fender then climb under the vehicle find the location of the filler tube connection from the hose to the tank just follow that hose down we're at clamps on 516 socket nice short extension and remove that hose clamp and remove the rubber line from the fuel tank once that's complete take a piece of smaller than 38 fuel line about 3 to 4 feet long preferrably and thread it through the filler neck being aware of the tank flap on the inside do not damage any obstruction of the tank assembly when trying to fish the host through then create a siphon into your collection cans until the tank is empty enough to achieve your goal pretty straightforward and common sense will help out more than my instruction

Hi I'm Peter, Not sure what your problem is from just posting fuel filler neck however I am assuming you have a strong gas smell. The rubber hose that connects the filler pipe on the tank to the fuel spout may be cracked and leaking. Another common problem is the tank vent tube that runs from the tank up along side the filler tube may be rubbing on the metal part of the tube and has a hole in it. This will give you the strong fume smell and possible fuel leak as will the rubber filler tube when the tank is full. These vehicles are known for this problem and also the metal filler pipe rusting causing a pin ole. Look to see if you can see rust anywhere . Even if you don't see rust on the outside does not mean there is not rust on the inside. I have seen where a lot of people have been have the rust issue also to the point they carry the part at auto parts stores . Hope this is what you needed.

CODE PO442 - EVAPORATIVE EMISSION EVAP SYSTEM SMALL LEAK DETECTED. POSSIBLE CAUSES, FUEL FILLER CAP IS LOOSE CROSS THREADED DAMAGED OR WRONG PART, FUEL TANK FUEL FILLER NECK OR FUEL SENDING UNIT O - RING IS LEAKING, FUEL TANK VAPOR LINES IS CLOGGED DAMAGED OR DISCONNECTED, FUEL TANK PRESSURE SENSOR LOW REFERENCE CIRCUIT IS OPEN, FUEL TANK PRESSURE SENSOR IS DAMAGED OR IT HAS FAILED, EVAP CHARCOAL CANISTER IS CLOGGED OR LOADED WITH FUEL OR WATER, EVAP PURGE OR EVAP VENT VALVE IS DAMAGED OR HAS FAILED, ECM FAILED.

CODE PO440 IS EVAP SYSTEM MALFUNCTION CONDITIONS. POSSIBLE CAUSES CHARCOAL CANISTER IS LOADED WITH FUEL OR MOISTURE. FUEL FILLER CAP IS LOOSE CROSS THREADED DAMAGED OR WRONG PART. FUEL TANK FUEL FILLER NECK OR FUEL SENDING UNIT O RING IS LEAKING. FUEL TANK PRESSURE SENSOR IS DAMAGED OR DISCONNECTED.OR FAILED.FUEL TANK VAPOR LINES IS CLOGGED DAMAGED OR DISCONNECTED.PURGE VALVE VAPOR LINE IS CLOGGED DAMAGED OR DISCONNECTED. PURGE OR VENT SOLENOID POWER CIRCUIT IS OPEN CHECK THE FUSE.PCM HAS FAILED.

Might have a leak in the fuel filler neck. either the neck itself has a hole (rust?) or the short rubber hose that connects the neck to the fuel tank is bad. Normally the fuel system is sealed, if the gas cap is loose, for example, that will cause a check engine light. I think you have a hole somewhere in the tank or filler neck that is causing this.
If you can examine it from underneath, you might be able to see the problem, look for stains from the gas. If you can see the problem, it should not be hard to fix.

Something is leaking, and you have fire risk.

I would normally pull the fuel tank, and if inspection showed nothing obvious, I would take the tank to a radiator shop and have them pressure test it...

Be very aware that any sparks will ignite the vapors, no need to burn, you know.....

Do not ignore this issue.

if it's a hose or pipe go to dealer or junk yard get another if broken clamp replace if neck part of tank call rad shop see if the can solder if you drain & pull tank

Are you going to get a new one, or a junkyard replacement?
You have to take off the rear left tire. Secure the car with jack stands and chucks. There is a plastic cowl on the wheel-well that covers the filler tube to prevent road damage. Take it off. The filler tube is attached to the gas tank through a rubber connector hose (tube) adapter, secured to the gas tank and to the filler tube by hose clamps. Loosen both clamps.. You should replace the rubber connector, as it has been there for many years, and rubber degrades. Loosen about three or four bolts along the filler tube that attach it to the car body. The top part, by the gas lid, comes off easily, it's just a plastic dam. You have to carefully work it off the (other end) at the rubber hose connector. Once it's out, get the hose connector off the gas tank neck.
With the new filler tube, reverse the process. Getting the hose clamp tight over the gas tank neck is hard. Make sure the clamp is seated properly before tightening.
Good luck!