[Healeys] su pumps again

[Oudesluys]

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


Op 23-11-2016 om 1:23 schreef Bob Spidell:
> Stumbled across this the other day (they also have them for later cars):
>
> http://www.bpnorthwest.com/austin-healey/bn1-bn2/fuel-system/fuel-pump-electronic-dual-polarity-bn1-bn4-mg-tf-mga-mgb-to-64.html
>
> NFI, and I've never used one.
>
> Bob
>
> ------------------------------------------------------------------------
>
>
> My car had a generic 'modern' plastic pump which worked fine but isn't
> quite kosher so I got a new SU pump from Burlen and that is where I
> discovered the diaphragm issue. It really does let quite a bit of
> petrol smell through- enough for me to take it apart and look for the
> leak. Burlen sent a replacement diaphragm which is, of course, no
> better.
>
> If you have a used 60 year old triple layer diaphragm for sale I'd be
> interested in upgrading my new one!
>
> The best design I have seen is an Italian copy that had a single layer
> clear plastic diaphragm and also a plastic toggle inside the points
> which is so much simpler than the mousetrap. Been in a Bn2 for longer
> than I have been alive and only needed a replacement inlet fibre
> sealing washer to stop a leak.
>
> Andy.
>
> On 11/23/16, Oudesluys <coudesluijs at chello.nl> wrote:
> > I have not come across the single layer diaphragms. I have seen offered
> > on ebay new dual layer ones from China and the UK. So far I have had
> > enough scrap pumps of the wrong type to provide enough good triple layer
> > diaphragms for the ones that were fit for a rebuild as the so called
> > High Pressure type I want, AUF301 or W/AZX1307/8 or equivalent, so I
> > have no experience with the modern replacements.
> > The permeation of petrol will probably very, very little if any, so I
> > would not worry about it. Some modern rubbers withstand all fuels and so
> > as long as these are used it will probably be OK. Time will tell. Anyway
> > the pumps cast iron coil housing and the space on top under the bakelite
> > cap over the points assembly is vented.
> > As the old triple layer diaphragms seem to last for ever I would not
> > replace them other then when they have become hard and cracked or when
> > the thin plastic membrane that keeps the petrol away from the rubber is
> > damaged.
> > Kees Oudesluijs
>
>
>
>
>
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