Simon,
Nearly all SU pumps are fitted with a capacitor, which makes the pump
dual polarity. So sparking is reduced anyway. Only early SU pumps did
not have a capacitor or diode.
Fitting a diode of course will make the pump single polarity which can
be reversed by reversing the diode. I believe the diode works better
than the capacitor, however all the pumps I have overhauled had a
capacitor which I left in place.
It is not always the sparking that destroys the points, damp conditions
cause electrolytic corrosion forming forming complete "cauliflowers".
If you still have single points replace them with a set of double points.
Kees Oudesluijs
Op 22-11-2016 om 13:28 schreef Simon Lachlan:
> Kees,
> Hi....surely VERY useful to fit a diode? In my own, purely personal, opinion
> I'd regard it as an essential step.
> Once the thing's apart, it must be a shame not to fit one?? After points are
> set correctly, sparking is the thing that gets them in the end?? Anything to
> slow down the process....
> Simon
>
> -----Original Message-----
> From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Oudesluys
> Sent: 22 November 2016 11:01
> To: healeys@autox.team.net
> Subject: Re: [Healeys] su pumps again
>
> Op 22-11-2016 om 0:19 schreef Bob Spidell:
>> Hmmmm ... Wonder why so many of us over here in the 'States have
>> problems with them? I think possibly the points manufactured in, say,
>> the last 30 years or so were substandard (I know those of recent
>> manufacture ARE substandard, confirmed by a respected rebuilder).
>> Maybe that's why your 'survivors' all had original points?
>>
>> Bob
> I think it is more a question of regular maintainance, but new points may be
> substandard like distributor contact points. Although I have not fitted new
> points yet, I do have some NOS original SU items, not the replica ones which
> may or may not be OK. Whenever I can lay my hands on NOS original items I
> get them, directly needed or not.
>
> Regular maintainance and repairing parts apparently is not a US thing,
> however here in Europe, and certainly the UK, we are quite used to it so we
> may clean the points now and then, which helps to keep them alive and
> prevent serious spark erosion.
>
> Once you have to tap the pump to get it going again for the first time you
> have to take action asap.
>
> The classic SU fuel pump with points is one of the most durable pumps in
> existence if properly maintained and always repairable, no modern fuel pump
> comes near.
>
> It may be useful to fit a diode to reduce sparking.
>
> Kees Oudesluijs
>
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