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Points in an SU fuel pump should last a very long way. In my first car
with the SU AUF301 (as in many A-H's 3000) it lasted at least 160.000mls
or 8 years (1977-1985) in my daily driver Jensen-Healey. Never even
touched the pump. After the car was laid up it was still started
regularly every year without trouble until the intervals became larger
and larger and about 5 years ago it failed. As my present Jensen-Healey
did not have an original fuel pump, I took the one from my old car and
rebuild it. The only thing wrong were the points. They had electrolytic
corrosion big time. Cleaning and polishing the points (2000 grid) and a
dusting of talcum powder between the three layers of the old fashioned
diaphragm to make it supple again, had it up and running in my new J-H
until this day, another 35.000mls. The trick is to set them up properly.
All explained in the SU instructions. Very easy. It is also imperative
that the car is used on a regular basis.
These pumps are very easy to rebuild. It only takes less than an hour.
Usually no new parts, apart from a gasket, are needed as long as you
leave the valves and its seals plus air chambers alone. These usually do
not need any attention. If it ain't broke, don't fix it. Check by
blowing/sucking into the in/outlet if there is any leakage (make sure
there is absolutely no fuel in the pump, inhaling fuel can be lethal).
In some instances the points can be worn beyond repair and they have to
be replaced, but even new points need to be cleaned, polished and set up
properly (0,9mm top blade, 2,3mm lower bridge).
Fit the pomp body and the coil body together with the vent hole of the
cap pointing upwards. Fit the pump in the proper orientation in the car
(indicated on the body).
Failing points could cause the pump to run erratic leading to fuel
starvation. Not a very common situation.
An SU pump incl. the points will nearly last you for ever, but it needs
maintenance. Every year clean the points wit a bit of double folded 2000
grid wet and dry and seal the cap with friction tape.
Main thing is these pumps need to be exercised regularly. Failing to do
so will cause them to fail.
Most will be fitted with a capacitor, a cilindrical yellow/gray part
fitted between earth and the spring blade with points. It works OK and
it makes the pump dual polarity. Later pumps have a diode fitted between
the power terminal and the points, this makes the pump polarity
sensitive, turning around the diode will change the polarity. I always
fit a transil, a sort of bidirectional zener diode, which make the pump
dual polarity as well and limits the maximum voltage to prevent
sparking. I often leave the capacitor in place as well.
Kees Oudesluijs
Op 25-5-2020 om 17:11 schreef simon.lachlan@alexarevel.plus.com:
>
> Basic question is: ?How long, approx., should they last? (Yes, there
> is a diode thing across them.)
>
> My car has been running OK. OKish?..I?d swapped back from Webers to
> the three HD6s and had the car set up at the rolling road place. They
> leaned the mixture settings somewhat, saying it would run better and
> use less fuel. (A relative term). I noticed that it took much longer
> to settle down after starting. Quite a lot of rude noises and much
> play on the choke at intersections. And, when it was up to
> temperature, I wondered whether it was quite right?was it a bit
> sluggish or was I just used to the Webers?
>
> The other day, it hesitated and would have cut out. But, with one
> bound I switched over pumps, and I was free! However, the pump ?
> double ended ? had to come off for inspection. Both sets of points
> were completely shot. I replaced them. Nasty, fiddly business. Now the
> car starts much better and performs better all round. Surprisingly so?.
>
> I installed that pump in 2012, +/-12,500 miles ago. So that?s +/-
> 6,250 miles per set of points.
>
> 1. Would failing points give those symptoms? (I was/am surprised?.I
> though points either delivered 100% or failed 100%. I know that a
> judicious thump on the bulkhead can work in the short term.)
> 2. How long would you expect SU points to last?
>
> Thanks,
>
> Simon
>
> Glorious weather here and forecast all week. Perfect Healey weather.
> One is allowed out, but not really encouraged to go anywhere!
> Maddening. Pubs are certainly shut. Anyhow, keep well.
>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
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>
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>
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<p>Points in an SU fuel pump should last a very long way. In my
first car with the SU AUF301 (as in many A-H's 3000) it lasted at
least 160.000mls or 8 years (1977-1985) in my daily driver
Jensen-Healey. Never even touched the pump. After the car was laid
up it was still started regularly every year without trouble until
the intervals became larger and larger and about 5 years ago it
failed. As my present Jensen-Healey did not have an original fuel
pump, I took the one from my old car and rebuild it. The only
thing wrong were the points. They had electrolytic corrosion big
time. Cleaning and polishing the points (2000 grid) and a dusting
of talcum powder between the three layers of the old fashioned
diaphragm to make it supple again, had it up and running in my new
J-H until this day, another 35.000mls. The trick is to set them up
properly. All explained in the SU instructions. Very easy. It is
also imperative that the car is used on a regular basis.<br>
</p>
<p>These pumps are very easy to rebuild. It only takes less than an
hour. Usually no new parts, apart from a gasket, are needed as
long as you leave the valves and its seals plus air chambers
alone. These usually do not need any attention. If it ain't broke,
don't fix it. Check by blowing/sucking into the in/outlet if there
is any leakage (make sure there is absolutely no fuel in the pump,
inhaling fuel can be lethal). In some instances the points can be
worn beyond repair and they have to be replaced, but even new
points need to be cleaned, polished and set up properly (0,9mm top
blade, 2,3mm lower bridge).</p>
<p>Fit the pomp body and the coil body together with the vent hole
of the cap pointing upwards. Fit the pump in the proper
orientation in the car (indicated on the body).</p>
<p>Failing points could cause the pump to run erratic leading to
fuel starvation. Not a very common situation.</p>
<p>An SU pump incl. the points will nearly last you for ever, but it
needs maintenance. Every year clean the points wit a bit of double
folded 2000 grid wet and dry and seal the cap with friction tape.</p>
<p>Main thing is these pumps need to be exercised regularly. Failing
to do so will cause them to fail.</p>
<p>Most will be fitted with a capacitor, a cilindrical yellow/gray
part fitted between earth and the spring blade with points. It
works OK and it makes the pump dual polarity. Later pumps have a
diode fitted between the power terminal and the points, this makes
the pump polarity sensitive, turning around the diode will change
the polarity. I always fit a transil, a sort of bidirectional
zener diode, which make the pump dual polarity as well and limits
the maximum voltage to prevent sparking. I often leave the
capacitor in place as well.<br>
</p>
<p><br>
</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 25-5-2020 om 17:11 schreef
<a class="moz-txt-link-abbreviated"
href="mailto:simon.lachlan@alexarevel.plus.com";>simon.lachlan@alexarevel.plus.com</a>:<br>
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<p class="MsoNormal">Basic question is: ?How long, approx.,
should they last? (Yes, there is a diode thing across
them.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My car has been running OK. OKish?..I?d
swapped back from Webers to the three HD6s and had the car set
up at the rolling road place. They leaned the mixture settings
somewhat, saying it would run better and use less fuel. (A
relative term). I noticed that it took much longer to settle
down after starting. Quite a lot of rude noises and much play
on the choke at intersections. And, when it was up to
temperature, I wondered whether it was quite right?was it a
bit sluggish or was I just used to the Webers?<o:p></o:p></p>
<p class="MsoNormal">The other day, it hesitated and would have
cut out. But, with one bound I switched over pumps, and I was
free! However, the pump ? double ended ? had to come off for
inspection. Both sets of points were completely shot. I
replaced them. Nasty, fiddly business. Now the car starts much
better and performs better all round. Surprisingly so?.<o:p></o:p></p>
<p class="MsoNormal">I installed that pump in 2012, +/-12,500
miles ago. So that?s +/- 6,250 miles per set of points.<o:p></o:p></p>
<ol style="margin-top:0cm" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo1">Would
failing points give those symptoms? (I was/am surprised?.I
though points either delivered 100% or failed 100%. I know
that a judicious thump on the bulkhead can work in the short
term.)<o:p></o:p></li>
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo1">How long
would you expect SU points to last?<o:p></o:p></li>
</ol>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Glorious weather here and forecast all
week. Perfect Healey weather. One is allowed out, but not
really encouraged to go anywhere! Maddening. Pubs are
certainly shut. Anyhow, keep well.<o:p></o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
</pre>
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