I've seen my fair share of dissected CIS pumps with the same commutator
wear.  Most of those pumps still worked but were noisy.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
David Beierl
Sent: Tuesday, July 23, 2013 5:02 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Fuel pump noise? Fuel filters.

At 01:17 PM 7/23/2013, neil n wrote:
>http://forums.pelicanparts.com/off-topic-discussions/737082-inside-failed-f
uel-pump.html

Now those images of the commutator wear are very interesting.  The
one I just took apart is also worn very deeply without a lot of brush
wear.  I thought I'd measure it.

Very Interesting Indeed.  What I have only looks like a seized
pump.  What I have is a totally irredeemably worn out pump that
happens also to be seized.

The depth of the wear gully in the commutator was about .035
inches.  There was maybe a bare .005 inches to go before you simply
ran out of copper.  That is an ex-parrot I mean pump, and so is the
one at Pelican Parts, and I bet so are a lot of the ones we're
driving around on.

Cheerful thought.  Too bad I haven't a clue of this one's history,
and no comparison with the one I took apart years ago where I did
know the history.

Yours,
David