[Healeys] Negative ground SU fuel pump question
Bob Spidell
bspidell at comcast.net
Mon May 10 20:44:44 MDT 2021
Until a couple years ago I was putting 6-8K miles on my BJ8 every year,
so I probably had more chances for failures than most.
bs
On 5/10/2021 12:47 PM, Michael Oritt wrote:
> I have a double-header on my 100 that Dave converted to solid state
> and rebuilt for me--it has performed faultlessly for probably ten
> years it is indeed interesting that several knowledgeable people have
> such differing experiences with SU solid state pumps, or for that
> matter other pieces of equipment, and it is hard to charge off either
> consistent success or repeated failures to luck of the draw. In the
> same vein, notwithstanding the popularity of FACET cubes I have had
> very little luck with them and on my Weber-carbed race cars I use
> Carter 4070's which have performed perfectly.
>
> Best--Michael Oritt
>
> On Mon, May 10, 2021 at 1:22 PM Bob Spidell <bspidell at comcast.net
> <mailto:bspidell at comcast.net>> wrote:
>
> The late Dave DuBois pursued the same retirement pastime on this
> side of
> The Pond. He designed a retrofit using the points to switch a power
> transistor, with the expectation that relieving the points of most of
> the current-passing duties would extend their life; he found that
> doing
> so caused the points to wear faster, as the current was
> insufficient to
> clean the points surfaces. He later designed a solid-state solution
> using an optical switch; I had him convert a couple pumps for me and
> although the conversion was very professional--and he bench tested
> them
> for 24hrs continuous--I had mixed success with them. My results with
> SU's SS pumps, either conversions or off-the-shelf has been
> inconsistent
> as well. I think Facet avoids this problem by having their pumps run
> more-or-less continuously. I tried transils and didn't get the
> expected
> result; I guess me and SU pumps just don't get along, but like some
> girlfriends I've had I stick with them anyway.
>
> Dave also noted, as did I, that the points available at the time were
> pure crap. They came in unmarked white boxes and appeared to be
> made out
> of (shiny) silver--go figure--whereas tungsten is a dull metallic
> color.
> Maybe the situation has improved in the last few years, but I haven't
> bought any for a while.
>
> Bob
>
> ps. If the pump is fitted with a capacitor, and the capacitor has '+'
> and '-' marks it will be polarity-sensitive (hence the marks).
>
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