but also have to state the situation is partially of your own making.
Now before the flames come let me explain.
I'll do so by admitting I've done this, what I'm about to cover, myself to my regret.
What you failed to do, well, let me describe what I failed to do so maybe it won't seem so confrontational...
What I failed to do was when I heard a faint high pitched squeal coming from my car (my 996 car that is) while I mentioned this to the techs I never demo'd it to them.
Eventually the car's CPO warranty lapsed.
Not too long afterwards, wouldn't you know that with warmer weather I drove the car to the dealer and the noise was present. The techs heard the noise and told me it arises from a high pressure valve in the power steering hydraulic system vibrating.
The fix is to replace the valve. The labor is not that bad. Just an hour or so. The problem is the valve's cost. The valve is not sold separately, but comes as part of a new power steering fluid reservoir. The cost of this reservoir is around $1000. The reservoir doesn't even have to be removed just the old valve removed and the new valve -- removed from the new reservoir -- then put in the old valve's place.
Because I didn't make an effort to demo this noise to the techs while the car was under warranty I now have to pay to have a problem fixed that has been present in the car since before the CPO warranty expired.
Oh, I just remembered yet another case where I screwed up... the car's radio was occasionally coming up while looking like it was working quite dead. No sound but all the buttons worked, the display at least followed the buttons. I brought this to attention of the techs and was told it was due to the device I have attached to the car's OBD2 port/connector or the number (2) electrical devices (V1 radar detector and Garmin Nuvi NAV unit) powered from the dash's cigarette lighter socket.
While I seriously doubted either the device connected to the car's OBD2 port or the 2 devices powered by the car's cigarette ligther socket had anything to do with the radio's symptom/behavior I was not willing to do without the radar detector or the NAV unit, and I was especially not willing to remove/unplug the device from the OBD2 port. I was then and still am testing this device in both of my cars (and this device is inside a number of other cars around the world.)
I later learned this radio behavior was a while rare problem a known one and solved with a radio controller software update.
However, as with the power steering fluid system valve noise I didn't push the issue and now I have to live with the radio once in a while, a great while, being dead. A key off key on sequence (or temporarily removing the radio's fuse) resurrects the radio but often it is not convenient for me to do this. Since I seldom listen to the radio, it is not that big of a deal. It just irritates me that I let something slide when I could have had this fixed/addressed under the car's CPO warranty had I been a bit smarter.
You are guilty of the same thing.
Because you didn't demo the issue to the techs, and because the symptom wasn't too bad, you let it go.
Far longer than you should have.
But all's well that ends well and you have a new and correctly working fuel pump and the car is transformed.
In a few days I'll have a quiet 996... the valve and its squeal will be gone.
Let me end by saying for the benefit of others, if your car exhibits some odd noise, or behavior, take the time to determine how to reproduce it and then do so in front a tech.
While the noise or behavior might be normal -- though be on the alert if you hear "they all do that" and do not accept this as gospel -- it might not be normal.
In the techs' world, no symptom means no problem. They have to see/hear/smell or whatever the symptoms or signs of a problem before they can do anything about it, even if and especially if, a warranty is involved. The factory is pretty explicit in what it requires a tech observe before it will authorize any warranty repair work.
(For instance, just a few days after I bought my 08 Cayman S the radio started acting funny. I took the car to the dealer where I bought the car and the SM got the car in and the tech connected a diagnostics computer to the car and after awhile told me he had reset the radio and a check out of it found it was working ok. The radio sounded ok in the service bay, too. I left. But the radio started acting up again not too long after I left. I was not able to get back to the same dealer and a few days later it was more convenient to take the car to another dealer. In spite of what I told the techs the 1st dealer had done, and in spite of the fact the radio was obviously not working right, the tech who was assigned to my car did the same thing, and this time the radio's condition had gotten worse and the reset/check out didn't resurrect the radio like it did before (at the 1st dealer) and a new radio was installed under the car's new car warranty.)
Sincerely,
MarcW.