thank you all for your responses....
After all efforts of checking each vacuum line and plug a few to determine where the leaks was located...i could not locate the leak, hence called a local mechanic. In a few minutes the mechanic was able to locate the leak! As it appears there is a fuel filler door vacuum element and is not properly working. I did not even know the fuel door also closes with vacuum, as i just thought the fuel door was never locked and was normal. Apparently the fuel door locks with a vacuum element as to secure the fuel tank. Therefore, I will have to replace such part to solve the nightmare door leak! Also, the two black lines that go into the firewall that are located under the steering wheel are vacuum vents that are not connected to anything.

thank you all for the support and guidance....

one

mecatli