Hi i recently bought a 2000 V6 Camaro 3.8L and it has about 136,500 miles on it. When i got it had a check engine light on so i took it to my work (Autozone) and pluged in the OBII scanner and it was pushin out a p0440 code which is a Evaporative Emission Control Leak. But the guy said he already replaced the gas cap so i just marked that off the list.

Then the other day i filled up my tank and i pulled into work and i noticed that it smelled like pure gasoline. So i look under the car and gas was dripping off the top of the gas tank. So i started to think, because the guy said the owner before him had a new fuel pump put in it about a year ago. So lastnight i ended up droppin the tank and putting a new fuel pump to tank seal. I also noticed that the filler neck had a small crack/cut in it. So for temp i just taped it up with black electrical tape.
Could this be pushing out the p0440 code?

Also when i got it i noticed that it was running a little rough so i decided to do a full tune up on it: Spark Plugs-NGK Platinum, Duralast Wireset, Oil Change and Transmission Filter and Fluid, New Belt. I also noticed that the back coil was really loose i tightend that up. Also i did the sea foam clean through the main vaccum line. I am also only getting about 13 mpg.
Could it be a coil pack going out?
I dont know what to do next because i have dont just about everything tune up wise.
So please help me out and let me know what you think it could be,
I would greatly appreciate it.

Thanks,
Chaz

 

chaz I have never recommended anyone to by a 100k plus mile car with multiple owners, for this reason. There are just to many problems sometimes. 13mpg for the v6 is terrible hell even for a LT1 its terrible.

Is the light still on? .... some genius could have messed with the PCM to "tune" it and just f'd things up. It sounds like there is just something wrong with the fuel system somewhere. How about the injectors? I wish you the best though. hopefully you can figure it out

 

#1 Chase mY Tail = Did you check compression? Low or poor gas mileage is more hammering down the pedal is make more HP with what little you have is 135K on a cracked fuel filler neck.

What are the odds, the crack in the filler neck begins to heat up the gas tank, slosh some liquid, created a pressure, and there is the gas cap sensor waiting for some pressure is the cap is pulled off and you can hear that minor air hissssss come out the cap?

Say you top off the gas, she sloshes out of the crack, down the hose, you drop the gas tank and change a fuel pump and not a filler neck by addressing that black electrical tape to a pressure to the sensor and not the back of the tape is check the dry gas running down to the top of the gas tank is change the filler neck not the fuel pump. No check engine light is pizz0440 on the floor.