JoesC5

I wonder why a good friend of mine, a retired GM Manager of Reliability Engineering, had a job? Would they be needed if the original design engineers had done their job in the first place?

Design engineers are not perfect designers and mistakes are made. Not every problem, as you seem to believe, is a result of poor quality of a perfect designed part/assembly.

LT1 Z51

People aren't perfect. Knowing this you have to prepare that some designs will have issues in the long run.

There is a difference between good intentioned design, and purposefully bad design. Over time design rules, best practices, and new requirements get generated to prevent issues. But sometimes technology changes, what was a good test and requirement on an iron part doesn't mean it works for aluminum or magnesium.

Plastics are in the same boat.

JoesC5

I said nothing about 'purposefully' bad design. I was talking about not every design being perfect with the design engineer doing his normal everyday job of designing 'stuff'.

If anyone is caught "purposefully' doing a bad job, whether it's engineering, production, accounting, etc, then they should be fired on the spot.

LT1 Z51

To me questioning if someone did their job is saying that they purposefully made a bad choice. Granted it's my interpretation of your words, so if you meant to communicate something else then I missed it.

Kent1999

I read all the information publicly available -- We'll have to agree to disagree about the so-called "faulty killer ignition switches". I'll file that under the same category as the "faulty" Audi unintended acceleration issue, the "faulty" Suzuki Samurai and Ford Explorer "roll over design flaws" where you might tip over if you yank the wheel at speed in a tall SUV. Same mentality at work there. People want freedom and choice -- as long as someone else fully protects them from EVERY possible negative outcome that can be imagined.

And GM is doing an absolutely horrible job keeping the extended warranty on the fuel tank a "secret" as you say, since they are sending out letters detailing their "secret" program to every address they had for the target years!

911Hunter

I also received the letter. Mine is a '14 Z51 A6 but haven't noticed any gasoline leak. Hope nothing related happens later on.

ptalar

When you design a part for reliability you look at MTBF (mean time between failures) and the number of failures per million hours of driving. The part can be designed to meet the reliability requirements and tested successfully. But that does not mean it meets those requirements in the field. You collect field data over time from the repair and replacement history to determine if the part met the reliability metrics. If not, you redesign the part and retest to a more robust design based on the field data, or you leave the design as is with a promise to fix as GM did if it fails. The failure appears to be a rare occurrence but it is a safety issue so they are doing the right thing. Sometimes it takes years to determine the reliability performance in the field. Also, it could be a manufacturing process defect that was uncovered. Which is not a design engineering mistake. When it comes to root cause and analysis of failures you have to look at a lot of factors.

Skid Row Joe

Was going through last month's mail today. I got the letter. I'm a month long traveler and mail doesn't all get opened right when I get home.

Coverage to; "10 years from in service date, or 120,000 miles." I'm good with that. I'll likely buy the GM Extended Warranty B2B plan at some point, and should maybe sell the car by the time 10 years elapses. I do love this C7 M7 convertible!

jimmie jam

By GM issuing the letter all they are doing is invoking the Greek Theory of "anus protectus".

767guy

^^^^^^^^^^^^^^^^^^^^

rmorin1249

Yep, the lawyers are big time CYA.

Rich0071

Got the letter for my 2014 stingray.

okaythen

So this is a rare failure is that right? Only happens to a small %?

So I guess pay attention and look out for gas smells I guess, gas leak on the floor, and check engine light?

But very serious problem if it happens ? heard many said "time bomb" "gas bomb in garage" etc

PatternDayTrader

When I was a kid, I drove around with an old Monte Carlo that the fuel tank was so rusted out it would pour fuel out if I filled it past 3/8ths of a tank. I drove that car, in that condition, for three years.

okaythen

LOL interesting story thanks for that. I guess don't worry too much but always pay attention.

PatternDayTrader

​​​​​​​Bingo.

GOLD72

Sad to see that C7 vette fuel tanks at the top pump mounting area are cracking much like so many of the C6 did. Never a problem after 11 years with my 07 vert, 5 years with the 06Z and now well over 7 years with the ZR1. However my son did after 4 years with his 08 coupe. Fortunately covered by warranty. The C6 driver side tank pump discharge plastic elbow fittings were prone to cracking I suspect due to inferior plastic grade materials.

Carvin

Yes. Traded my 2008 with 74K miles and no fuel pump problem but thought I was getting away from that when I got my C7.

Dave80C3

I got the letter for my 14 Stingray, two weeks after I traded it. Did they correct it by the time the 18's came out?

Judgment Day

^ If it was corrected, it happened either by the time the 2018s were released or sometime very late in the 2017 run. This thread and distribution of letters has been going on for awhile now, and I've yet to receive one. The warranty has also not appeared on my "MyChevrolet" dashboard.