It's been a little while since I researched the '09+ cars, but is VWoA now paying for any/all failures? I distinctly recall hearing of a few very low mile failures and VW balked at replacing the systems and indicated they were user error when the user insisted otherwise. Furthermore, others definitely have paid upwards of 7-9k to replace their own complete fuel systems.
So... what gives?
I gather that in the US so far they have been systematically paying for all failures. Assuming that the fueling guards are in place, it's getting hard for them to claim a fueling error is the issue though I suppose they could still claim that the fuel itself was contaminated.
In Canada though, it's another story. The HPFP isn't even covered by the powertrain warranty. Once the 80k km (50k miles) bumper-to-bumper warranty is up, you're out of luck. When VW replaced mine (before complete failure they claim, and to solve a problem that was not solved by HPFP replacement), I had 92k km on the car, just 12k beyond the b-to-b warranty. VW initially refused to pay anything. Coincidentally so did I. VW eventually settled on paying 2/3 for a reman part, I insisted on new so the VW contribution ended up being 1/2.
I'm sure if it blew now at 116k km, I'd be out of luck, as the new part was only covered for 1 yr/20k km.
You're in the US so you might be OK, but if I was in your shoes, I'd try and stick to VW-certified used bought from a VW dealer, as you'd get at least some warranty plus a car with (supposedly) a pedigree and documented service which will help your case if there was an issue.