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Discussion Starter #21
Last update. It wasn't the gas. Or the fuel pumps.

It was a damaged pigtail on the fuel injector harness paired with a failed fuel rail pressure sensor.

Official diagnosis was pigtail had been damaged (i.e. Pulled out by the wires) previously and degraded overtime (years) to the point of failure.

Fuel pressure sensor failed due to constant cycling of rich/lean commands over time.

Everything is perfect now. Even the slight stumble I was getting at idle is gone, which is something I've seen mentioned a lot as being diagnosed as bad injectors only to reappear again after replacement. Might be worth checking the harness if anyone else has that issue.

Repair cost at a pricey (but flawless) service center was $1100, haggle down to $632. $300 for parts, $300 for labor
 

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Just for future reference, your HPFP is not the same as your in-tank fuel pump.... Your HPFP sits up on the motor and pressurizes the fuel to, at times, 1500psi. It is also about the only item that will put raw fuel in your oil...usually.
 
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