E28 start/stalling

["Dan, Marilyn, Anathea & Phillip Patzer" <bmrfamly@xxxxxxxxxx>]

Joe
  Your fuel pump is energized by the "start system" for start-up, then a
different "run-system" when the key transitions from start to run positions.
  Sounds like your fuel pump relay has failed.  Locate it in/near the fuse
box.  Using a couple inches of appropriate gauge wire and a couple male
spade clips bypass the relay for a test (or swap the relay with an
identical one that works, i.e. the horn relay on some yr/models).  On BMW's
the the relay terminal #30 is HOT 12 Volts, the #87 goes to the appliance
(fuel pump in this case).  Bridge these two positions within the relay
socket and give it a try.
  This is for start/run test only.  The car cannot be driven without the
relay, as the relay shuts off the pump in case of an accident.
  Terminals #85 & 86 on the relay are the primary triggering circuit.  If
the test worked, but a new/working relay didn't help, look into the primary
circuit.

 Dan Patzer the CyberWrench from BIMMERS ONLY
72' tii touring   K1200LT   85' 732i   R850R
http://www.nwlink.com/~bmrfamly/   425-259-3601
 O.E.M. parts, Independant service since 1967
 12724  Marine Drive,  Marysville, Wa. 98271

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