[Healeys] Fuel pumps (AGAIN!)

Bob Spidell 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
> www.britishcarspecialists.com
> 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.
> www.britishsportscarhall.org
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