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Either the Gas Cap is shot or the tank vent is clogged. First thing i would recommend would be to try swapping the gas cap for one from another car (without the same problem).
The Gas Cap should be a vented style cap, but if it quits it can build up pressure inside the tank. If swapping the cap doesn't stop the pressure, than the vent is clogged, it's on top of the tank
If you mean the fuel line,start the engine, then remove the fuel pump relay , when not enough fuel pressure to run the engine, it will die and line will be depressurized. The tank itself only has minimal pressure which is vented. Removing the filler (gas) cap will relieve any excess pressure in the tank...Mike
P0440 code translates to Evaporative Emmission System (EVAP). I suspect that your gas cap is not fitting tight enough on your tank to build up enough pressure to keep the EVAP sensor from detecting a fault. You may have to replace your gas cap or check to see if it was tight. It may take a few trips with the fault fixed to extinguish the light and more to get rid of the P0440 code in your computer. Removing the cable on your battery, the negative one for about two or three minutes may be enough to make your computer forget.
I am not sure I understan tghe question. You should not have a lot of pressure in the tank. There are hoses that capture any vapors that are in the tank and eleviate pressure build up. Most often I have found the engine light on because of gas tank vent, such as loose or bad gas cap or the vent valve stuck open. The computer does a cycle ever so often and maintains the vent pressure build up in the gas tank and vapor canister, and if the purge valve sticks open the computer gives a check engine light and code as the pressure is not in the vapor storage tank when called for. If your worried about no pressure at all then I would change the gas cap and see if this helps
Make sure that the gas cap is the correct one. If the gas cap was replaced with a different style or a locking cap this will set off the check engine light. It can tell there is a problem because it measures the built-up pressure in the gas tank. So the pressure is not building in the tank due to a loose or incorrect fitting gas cap or a loose,cracked fuel line, or bad check valve in the charcoal canister for the fuel tank vapor release line.
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Sounds like your gas cap may not be on right or is faulty ...and is now heat is forcing the fuel out of your gas tank. If removing and reinstalling the gas cap or even replacing it doesnt work, this is just an idea as to what the problem is. This is a very hazardous driving situation. I would NOT let anyone drive this car at the moment. Call a repair shop that has the ability to tow the vehicle. and expect a price tag somehwere in the range of 600-800 dollars to replace a fuel pump plus towing. Leaking fuel at that rate is not to be taken lightly. In anycase,it could be a fault in the fuel vapor canister, fuel lines clogged or damaged or even a faulty gas cap. I just want you to be safe at all costs...and if towing it ensures it...then do it.