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940 In-Tank Fuel Pump Failure: Another one here

uid 18083's pic
posted by  lucid on  Sat Jun 6 01:51 CST 2009
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"I don't think I've ever seen a car part that fails with such predictability. Oh yeah, mine failed at ~150,000."

Maybe not typical, but my son's '92 940 pump just quit (actually a fail-to-start) at 200,800 miles. I helped him replace it a few days ago (485 mile round trip) and brought the "dead" pump home.

Yesterday, just for the hell of it I put +12V to it and it buzzed like new. At least enough to blow off the plastic cap I'd put on the outlet.

My guess it's brush/commutator related as there was voltage at the trunk connector at the time of failure, and resistance checks thru the pump's pink and black wires seemed very high and jumpy (as related to me by phone).

Disclosure: Before applying the +12V, I had turned the commutator by picking at the impeller. And resistance across the brushes is now around 3 to 4 ohms.

Art, are you up for the forensics or shall I hack away at it?


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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