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Jim Adney wrote: > Do you mean that there is a screen at the inlet and a filter at the > outlet? > > > Correct. There is a nylon screen in the inlet that's very fine, though certainly not as fine as the filtration media. It's soiled black, but looks fairly normal compared to most other fuel pump inlet strainers I've seen. I see no sediment in the tank, especially in the fuel bowl. >All of this is just speculation on my part, but grit doesn't even have to be >visible to be important. The kind of dust that blows around on a dry windy day >may be enough to do the damage you see. Plus, the copper in the commutator is >very soft, so a bit of grit that finds its way in there can get imbedded in the >copper and chew away at the brushes forever. > > Right now I'm thinking the more likely scenario is a combination of too-soft brushes and a commutator that's out-of-round. Would an out-of-round commutator accelerate brush wear? I would buy that as a reasonable assertion. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~