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Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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The Bosch OEM pumps tended to have asymmetric terminals and a matching wiring harness plug that ensured the correct polarity. The replacement fuel pumps come with instructions stating reversed polarity will damage the pump and void the warranty. I haven't looked into the exact reason but I suspect the roller cell pump elements do not "like" being mechanically turned in reverse.
Last edited by Jim Sims; 09-16-2006 at 11:54 AM..
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