[Healeys] Fuel pumps (AGAIN!)
bspidell at comcast.net
Tue Dec 4 20:55:49 MST 2018
Are the factory settings per SU the same as those in the shop manual
(Bentley, in my case)?
On 11/29/2018 8:18 AM, David Nock wrote:
> We install and sell probably about 50 to 75 SU fuel pump a year with
> almost 0 returns. The only time when we had an issue with the SU pumps
> is when they first came out with the Positive Ground pumps.
> The reason for this is they went backwards in time about 50 years.
> Originally the pumps only had a set of points and no condensor. Then
> they installed a condensor in the early 50s to solve the pitting
> points and sticking problems they were having. These pumps were used
> thru the early 80’s with very few issues other than failures due to
> age. Sometime in the late 80’s or early 90’s there was a demand for
> originallity for a Positive Ground pump at the time the had changed
> from a condensor to a diode in across the points. So the answer to a
> Positive Ground pump was to remove the diode. This returned the pump
> the original design and they started having pump failures in the
> Positive ground pumps.
> Then somewhere in the late 90’s they started installing a non polarity
> concious diode in all the pumps. Thus solving the problem with pump
> failure due to the points.
> The one issue that we did find with the pumps in the late 90’s up
> until about 2005 was that the diaphgrams / points adjustments were
> incorrect. So we would always pull all of our pumps apart and re
> adjust the points to the factory settings as per SU.
> David Nock
> healeydoc at sbcglobal.net
> 209 948 8767
> Help us have our Founder Norman Nock inducteed into the
> British Sportscar Hall of Fame, You can vote for your favorites
> by visiting the site at.
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