Just adding some more data to the thread: 2014 A4 B8.5, TSFI engine, 6spd manual, roughly 100k miles. (I think mine is the CAED engine, but not 100% positive). I got the Hitachi pump from FCP Euro, ended up being just over $400 with tax and shipping:
https://www.fcpeuro.com/products/aud...ump-06j127025j. I looked at ECS Tuning but all their pumps said they're only for the TSI, not TFSI, engine. I don't know why that would be, but I decided not to chance it.
The only apparent symptoms I had were 1) slightly harder starting when cold, and 2) it would almost imperceptibly stumble sometimes at low rpms, like when driving at very slow speeds in a parking lot. After a couple months of those symptoms (thinking maybe my battery was the culprit), I got the P2188 code.
After replacing the HPFP, everything is back to normal, and running much more smoothly now. I watched a couple Naptown Tuner vids on youtube as the sole research and prep to do the job. It's not a difficult job overall, but there are a couple things that can be a pain if you're not prepared. First off, when trying to pull the vacuum tube as well as the low pressure fuel inlet to the HPFP, the stock hose clamps would simply not open wide enough to slide back on the rubber hoses. What should've taken 3 minutes took 30 as I tried to squeeze them hard enough to slip back on the tubes. I ended up needing to bend the tabs on both of them so I could squeeze them farther to open up more. Never had that problem before, in many many years of using these types of simple clamps. When I did finally get the fuel line off, since my car had been sitting for a few days, it barely dribbled. When done, I replaced the offending hose clamps with "type g" style hose clamps, similar to t-bolt clamps. I'm not a big fan of worm-drive hose clamps.
The other thing that tripped me up was my 10mm triple square bit wouldn't fit for the upper pump bolt. As someone else mentioned, you need a long-style #10 triple square bit, as the access is narrow. The type of bit which is inserted in a 3/8" adapter won't work. After buying a longer bit, the pump came off pretty easily.
I checked the cam follower roller bearing and it looked immaculate, so I left it alone. To get the pump back on, I used the method of starting the triple square bolts at the same time, then slowly tightening each one a couple turns at a time to evenly pull the pump into place, as the plunger spring gets depressed. It'll make sense when you get in there. I also had no trouble getting the hard fuel line back on the bottom of the pump- loosening the T-30 bolt on the little holder clamp helped. You do need some sort of short 17mm wrench to get to the flare nut on that line though. I have a set of flare nut wrenches that worked well.
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Originally Posted by audi-root
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