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I have asked myself the same question. The air chamber evens out
pressure pulses to some degree and may possibly only be used with high
pressure pumps that are positioned near the fuel tank. Also some
carburettors are more sensitive to pressure pulses than others. These
pumps were used on a multitude of cars with all types of carbs, from
simple SU's to complicated DellOrto's.
It is an extra complication but it does not do any harm.
Kees Oudesluijs
Op 23-11-2016 om 15:48 schreef Bob Spidell:
> "... you may have to add a small accumulator in the pressure line to
> compensate for the air chamber ..."
>
> Begs the question as to why the earlier pumps didn't need/have the
> accumulator? Did SU, or somebody, identify an issue that the
> accumulator solved? The SU pump in our BN2--sans accumulator--seems
> to work OK.
>
> Bob
>
> ------------------------------------------------------------------------
> *From: *"Oudesluys" <coudesluijs@chello.nl>
> *To: *"healeys" <healeys@autox.team.net>
> *Sent: *Wednesday, November 23, 2016 1:30:30 AM
> *Subject: *Re: [Healeys] su pumps again
>
> These are supposed to be of reasonable quality, however you may have
> to add a small accumulator in the pressure line to compensate for the
> air chamber as used in many SU-pumps. They are quite common in the
> Netherlands.
> There is also an Australian SU look-a like with a black plastic coil
> housing. The make eludes me at the moment due to age I suppose.
> Quality is supposed to be OK as well. Both pumps are electronic.
> Contrary to the usual replacements these pumps stop when the max.
> pressure has been reached, similar to the SU pumps.
> Kees Oudesluijs
>
>
>
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<div class="moz-cite-prefix">I have asked myself the same question.
The air chamber evens out pressure pulses to some degree and may
possibly only be used with high pressure pumps that are positioned
near the fuel tank. Also some carburettors are more sensitive to
pressure pulses than others. These pumps were used on a multitude
of cars with all types of carbs, from simple SU's to complicated
DellOrto's. <br>
It is an extra complication but it does not do any harm.<br>
Kees Oudesluijs<br>
<br>
Op 23-11-2016 om 15:48 schreef Bob Spidell:<br>
</div>
<blockquote
cite="mid:829099382.51113818.1479912491457.JavaMail.zimbra@comcast.net"
type="cite">
<meta http-equiv="Context-Type" content="text/html; charset=utf-8">
<div>
<div>"... you may have to add a small accumulator in the
pressure line to compensate for the air chamber ..."<br>
</div>
<div><br>
</div>
<div>Begs the question as to why the earlier pumps didn't
need/have the accumulator? Did SU, or somebody, identify an
issue that the accumulator solved? The SU pump in our
BN2--sans accumulator--seems to work OK.<br>
</div>
<div><br>
</div>
<div>Bob<br>
</div>
<div><br>
</div>
<hr id="zwchr">
<div><b>From: </b>"Oudesluys" <a class="moz-txt-link-rfc2396E"
href="mailto:coudesluijs@chello.nl";><coudesluijs@chello.nl></a><br>
<b>To: </b>"healeys" <a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a><br>
<b>Sent: </b>Wednesday, November 23, 2016 1:30:30 AM<br>
<b>Subject: </b>Re: [Healeys] su pumps again<br>
<div><br>
</div>
<div class="moz-cite-prefix">These are supposed to be of
reasonable quality, however you may have to add a small
accumulator in the pressure line to compensate for the air
chamber as used in many SU-pumps. They are quite common in
the Netherlands.<br>
There is also an Australian SU look-a like with a black
plastic coil housing. The make eludes me at the moment due
to age I suppose. Quality is supposed to be OK as well. Both
pumps are electronic.<br>
Contrary to the usual replacements these pumps stop when the
max. pressure has been reached, similar to the SU pumps.<br>
Kees Oudesluijs<br>
<br>
<br class="moz-cite-prefix">
</div>
</div>
<div><br>
</div>
</div>
</blockquote>
<p><br>
</p>
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