[Healeys] fuel pump polarity

Mal Bruce mbruce6 at cogeco.ca
Mon Aug 31 12:57:42 MDT 2009


Thanks Bob, I have two pumps that conform to #2. The red wire runs to the
brass stud which holds the cap on while the black runs to the screw head
beside the stud. There is a ground wire coming up from the brass sidearm of
the lower point set and going to a third screw, neither of which has a black
or red running to it. Two black wires emerge from a sleeve running up from the
pump body and join the same terminal as the black and red wires. I still can't
determine which is the ground, what am I missing?

Mal
  ----- Original Message -----
  From: Bob Spidell
  To: Mal Bruce
  Cc: healeys at autox.team.net
  Sent: Monday, August 31, 2009 11:55 AM
  Subject: Re: [Healeys] fuel pump polarity


  The only determinant of polarity is what's used to mitigate point erosion:

  1) nothing (early pumps)
  2) capacitor (mid-age pumps)
  3) diode (most recent pumps)

  To be sure, remove the plastic cap on the end of the pump.  If there's
nothing besides points and the throwover mechanism, polarity doesn't matter.
If there's a diode--the stock ones are a black plastic canister with red
(positive) and black (negative) leads--determine which lead goes to ground
(across the points).  Same story with a capacitor, but it might be harder to
determine the polarity, if any, of the cap (it might have a "+" and "-"  on
either end).  I believe the caps are electrolytic, and if the polarity is
reversed the cap will be destroyed (probably become a dead short).  If the
diode is forward-biased you'll have a dead short, and the pump won't work.

  To change polarity reverse the cap or diode leads.


  bs

  --------------------------------
  Bob Spidell - San Jose, CA

  ----- Original Message -----
  From: "Mal Bruce" <mbruce6 at cogeco.ca>
  To: healeys at autox.team.net
  Sent: Monday, August 31, 2009 8:10:51 AM GMT -08:00 US/Canada Pacific
  Subject: [Healeys] fuel pump polarity

  I have four fuel pumps, three are AUB 662-1 and the other is AUB 662. Since
  the pumps have all been used at one time or another on both MGC and BJ8,
  negative and positive ground respectively, how do I find the polarity.
Thanks
  in advance for the help.

  Mal
  _______________________________________________




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