They don't last forever, evidently.
Since it's a cheap and easy replacement, slapping another FPCM in there would be what I'd try next. (Assuming you don't want to plunk down a few Benjamins to replace it with an aftermarket unit.)
The voltage drop across the OEM unit was around 1.5v. It was around 1.0v on the first STi unit I bought. It was 0.1v on the second unit I bought.
The second unit completely eliminated my fuel pressure problem, as the pump was finally seeing the current it needed to keep up.
Specifically, the 04 STi FPCM.
The internal wiring is nearly 2x larger. I noticed significantly less voltage drop across the STi unit. This is all detailed in earlier posts in the thread, if you care to read it.
Logged in the sense that I watched my fuel pressure gauge rise and then fall as I was doing pulls, yes. I believe I detailed this in an earlier post in this thread.
This. +1,000,000,000.
eBay is where I bought both of mine... around $40 a pop.
Yep! Turned out that the first FPCM I bought was bunk. Bought a second replacement and the problems suddenly went away.
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Yeah, I understand the manufacturing and cost logic behind it, but that certainly doesn't make it any less shitty.
I used these ones: http://www.connectorsupply.com/catalog/butt-splice-heat-shrink-step-down-16-14-to-12-10-ga-p-480.html
I think I paid $53 for the harness locally with tax. So $49 is in the ballpark.
Yeah, I just couldn't deal with it looking like shit.
Yep - all 6 wires were spliced into the factory harness. Also yes, that part number is for the complete fuel harness, but it won't work with the Legacy in its entirety. I tried. It doesn't seem to line up. One obvious discrepancy is that the length of wiring from the grommet to the fuel pump plug is WAY too short to work on our car.