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An SU pump with points when polarity sensitive is easy to convert to non
polarity sensitive. Just replace the diode with a bi-directional
transil/TVS. Converting the electronic polarity sensitive pumps is more
involved.
Kees Oudesluijs
Op 25-4-2023 om 09:36 schreef Patrick & Caroline Quinn via Healeys:
>
> Gâ??day
>
> To increase the amount of collective trivia knowledge, everyone might
> be interested to know that Warwick built Healeys or real Healeys were
> fitted originally with twin SU fuel pumps. One for sea level driving
> and the other for Alpine. To change from one to another or to both
> itâ??s a matter of pressing a button on the dash.
>
> One of the pumps fitted to my 1948 Healey Duncan is still points
> operated, while the other is electronic. The electronic pump is
> polarity sensitive (+ve), while the points pump is not.
>
> Hoo Roo
>
> Patrick Quinn
>
> *From:*Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Simon
> Lachlan via Healeys
> *Sent:* Tuesday, April 25, 2023 12:25 AM
> *Cc:* 'Healeys' <healeys@autox.team.net>
> *Subject:* Re: [Healeys] fuel pump
>
> Iâ??ve installed a double-ended SU which sort of reinforces my faith in
> SU whilst doubling up on the reserve pump option. One can switch from
> end to end, both of which are individually fused. One end did fail and
> the other got me home. It was the points.
>
> Simon
>
>
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<p>An SU pump with points when polarity sensitive is easy to convert
to non polarity sensitive. Just replace the diode with a
bi-directional transil/TVS. Converting the electronic polarity
sensitive pumps is more involved.</p>
<p>Kees Oudesluijs<br>
</p>
<div class="moz-cite-prefix">Op 25-4-2023 om 09:36 schreef Patrick
& Caroline Quinn via Healeys:<br>
</div>
<blockquote type="cite"
cite="mid:007d01d97748$a53b0700$efb11500$@tpg.com.au">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Gâ??day<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">To
increase the amount of collective trivia knowledge, everyone
might be interested to know that Warwick built Healeys or
real Healeys were fitted originally with twin SU fuel pumps.
One for sea level driving and the other for Alpine. To
change from one to another or to both itâ??s a matter of
pressing a button on the dash.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">One
of the pumps fitted to my 1948 Healey Duncan is still points
operated, while the other is electronic. The electronic pump
is polarity sensitive (+ve), while the points pump is
not.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hoo
Roo<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Patrick
Quinn<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Healeys
<a class="moz-txt-link-rfc2396E"
href="mailto:healeys-bounces@autox.team.net";><healeys-bounces@autox.team.net></a>
<b>On Behalf Of
</b>Simon Lachlan via Healeys<br>
<b>Sent:</b> Tuesday, April 25, 2023 12:25 AM<br>
<b>Cc:</b> 'Healeys' <a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] fuel pump<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"
lang="EN-GB">Iâ??ve installed a double-ended SU which sort of
reinforces my faith in SU whilst doubling up on the reserve
pump option. One can switch from end to end, both of which
are individually fused. One end did fail and the other got
me home. It was the points.<o:p></o:p></span></p>
<div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
lang="EN-US">Simon<o:p></o:p></span></p>
</blockquote>
</div>
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<td style="width: 470px; padding-top: 12px; color:
#41424e; font-size: 13px; font-family: Arial, Helvetica,
sans-serif; line-height: 18px;">Virus-free.<a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient";
target="_blank" style="color: #4453ea;"
moz-do-not-send="true">www.avast.com</a></td>
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<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/healeys";>http://autox.team.net/archive/healeys</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>
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