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Hey Guys:
I have a new issue on my 2013 C6 Coup, with only 37000 miles, which developed about two weeks ago. When I get into my car I smell gasoline fumes intermittently in the cabin.
My fuel mileage has not been great! I opened the hood, looked all around for any leakage or gas smell, try to look under the car to see if there were
any traces of gas........none! And nothing on the driveway. I only notice it when I get into my car.
Could the fuel line be leaking where I can't see it?
Is their a sensing tool that I could use to trace the leak?
NHTSA should force GM to cover this expense regardless of how old it is as it can be very dangerous. It’s a very expensive repair if you have auto trans. I do not know why when the engineers first found out about it , they never redesigned it or change that deteriorating plastic neck for a metal neck. They never modify things as they keep using the old design in later cars. Similar to the Harmonic Balancer ! They know the balancer is not great as it wobbles after awhile. They still use these across the board for many years.
Most likely the fuel tank or crossover tube/hose. Until you get the gas odor diagnosed, (at Chevy dealer or a Vette mechanic) try keeping the fuel tank just under 1/2 full, or less. The smell of gas should diminish and your Vette won't stink up the garage and be a potential hazard.
NHTSA should force GM to cover this expense regardless of how old it is as it can be very dangerous. It’s a very expensive repair if you have auto trans. I do not know why when the engineers first found out about it , they never redesigned it or change that deteriorating plastic neck for a metal neck. They never modify things as they keep using the old design in later cars. Similar to the Harmonic Balancer ! They know the balancer is not great as it wobbles after awhile. They still use these across the board for many years.
Except its not really that dangerous, more just a nuisance. People forget that cars use to have carburetors that would sit open to the air all the time. The fumes aren't going to ignite and set off like a bomb. By that logic GM should repair every 69 camaro that got floor board rust 20 years after it left the factory. GM isn't responsible for these cars anymore and they know it. Where I agree, they should have designed it better... the fact is they didn't and we as enthusiasts can either choose to deal with it or fix it ourselves. There's solutions to repair the problem out there, its a good solid day or two of work to replace but once its done its done. It's not the end of the world though.
Most likely you are in for an expensive repair, your fuel tank fittings may be leaking which requires the disassembly of the entire rear drivetrain to gain access to them...check out the numerous threads on this issue using the search feature
Someone has to get to a wrecked C6 where they can cut out the area above the fittings. That way they could figure out where to cut so you can gain access from above.
Someone has to get to a wrecked C6 where they can cut out the area above the fittings. That way they could figure out where to cut so you can gain access from above.
Unfortunately there isn't enough room, you'd have to cut into the structure of the car. See pic below
I have a deposit down on an out-of-state one owner 2009 Z06 with less than 6k miles that I am going to test drive next week. Aside from the obvious gasoline smell in the cabin, is there any other evidence of this problem I should be looking for when I inspect the car?
There are no visible signs that can be seen from the outside of the vehicle you would have to do major disassembly to look at the elbow on the top of the tank. The balancer is always a possible problem but it is visible from the top of the engine while idling. Good luck on the ZO6.
It's more than just fumes. The fuel pump elbow leaks raw gas until it pools up on top of the drivers side gas tank and then spills down the back side of it. It is a safety issue. The area it leaks is just above the hot exhaust. I worked with NHTSA for over a year on this issue and finally was able to get them to force GM to at least cover the repairs, but it had a time limit on it that I believe has now expired.
The designers could have made this much easier to repair if they had made an access port above the fuel tank for the fuel pump. If you have an automatic car, the entire transmission, rear end, rear suspension, and exhaust have to come out just to pull the driver side fuel tank. If you do this job, be sure to replace the fuel sending unit in the passenger side tank while you have it apart so you don't have to do the job twice.
Except its not really that dangerous, more just a nuisance. People forget that cars use to have carburetors that would sit open to the air all the time. The fumes aren't going to ignite and set off like a bomb. By that logic GM should repair every 69 camaro that got floor board rust 20 years after it left the factory. GM isn't responsible for these cars anymore and they know it. Where I agree, they should have designed it better... the fact is they didn't and we as enthusiasts can either choose to deal with it or fix it ourselves. There's solutions to repair the problem out there, its a good solid day or two of work to replace but once its done its done. It's not the end of the world though.
Originally Posted by CSixDude
The drivers tank on the manual can be removed without tearing the whole rear end out of the car, so it's quite a bit easier.
Two questions:
1: Is the driver side tank the side with the plastic elbow that can crack and seep gas?
2: Are the replacement parts prone to the same failure in the future, or once the repair is made, your good to go?
Yes, the elbow that cracks and leaks is at the top of the fuel pump in the drivers side tank.
The part number of the pump has changed and if you get the new Geniune GM pump, you shouldn't have this problem again. Don't buy knock of chinese crap pumps.
You should also plan to replace the O rings and plastic tubes inside the crossover tube, as they frequently break in the process of separating the crossover tube from the tank. Getting the crossover tube to separate is the hardest part of this job.
Very expensive repair, and mistake from GM, has others say don't fill your tank to full, 1/2 tank, and fumes will disappear.
I see this posted a lot and it makes no sense, the elbow that is cracked is the fuel pump outlet that leaks under pressure, so I don't understand how fuel level plays into this.
I see this posted a lot and it makes no sense, the elbow that is cracked is the fuel pump outlet that leaks under pressure, so I don't understand how fuel level plays into this.
It leaks regardless of fuel level in the tank. Whenever the system is pressurized fuel sprays out the crack in the elbow. People post bad info and then others repeat it.
It leaks regardless of fuel level in the tank. Whenever the system is pressurized fuel sprays out the crack in the elbow. People post bad info and then others repeat it.
Not true. Many members (including me) have had this issue, and found that when the RH tank is empty (fuel gauge shows less than half) the gas smell goes away. I can't explain it, but it's true. I ran with less than half a tank for a month with no issues and no smell, and when I overfilled the tank by maybe a gallon or two, the gas smell was back. When I replaced the fuel pump I could find no indication of a crack in the elbow, but replacing the pump worked, I've had no fuel smell for 500+ miles and the tank over half most of that time.
06-13-2024, 08:59 PM
Smelling gas fumes
