Quote:
Originally Posted by andrewwynn
...Apply power to the pump directly. If you get pressure at the rail it should start.
If no pressure at the rail/no pump noise it's likely the pump itself.
–awr–
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I think we have a winner (for diagnostics, not for my pocketbook). I used my generic Power Probe alternative
to apply power (12.6vdc) to the pump's positive terminal (where the white w/blue stripe wire attaches), and the ground wire/alligator clip to the pump's negative terminal (where the thicker brown wire attaches).
I tried several times (while using my multimeter to confirm that voltage was being applied), with no result. No sound, no vibration, no nothing from the pump.
Now, I'll be shopping for a replacement pump.
By the way, it looks like this pump has been there for many years, judging by the accumulation of dirt and dead spiders on top of the pump, and under the seat. I'll never know if it was the original, even after I pull it and clean it.
In my experience, I have had to replace in-tank fuel pumps only three times before: on my '86 S-10 in 1999 (at 200k miles), on the '98 GMC 1500 twice (mileage not recorded), and in 2000 and 2004? (I helped do it, when the truck belonged to a friend). The GMC is still on its' third pump, after 21 years and now at 186k miles, go figure. With the disparity in longevity of those first three pumps (13, 2, and 2 years) I have no idea of whats normal for these pumps.
My '09 Chevy HHR Panel and my '04 Chevy 2500HD pickup are (knock-on-wood) still on their originals, at 185k and 141k miles, respectively, as a point of reference. So if the '01 E53 has made it to 212K miles on the OEM pump, that's pretty good!