My '88 325 did this. Intermittent, then increasingly more unreliable
and finally died. Tested, found the bad one (fuel pump), sawed the
package open with a pocket knife, sandpapered the contacts, squeezed
them together a bit and drove home. Then I replaced all three relays
for about $30. (www.BavAuto.com Bentley's tells you how to test the
relay; apply 12v to the "primary" side and check for continuity on the
"secondary" side. Haven't had a moment of trouble since replacement.
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