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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
----- Original Message -----
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@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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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">Stumbled across this the other day (th=
ey also have them for later cars):<br></div><div aria-label=3D"Compose body=
"><br></div><div aria-label=3D"Compose body"><a href=3D"http://www.bpnorthw=
est.com/austin-healey/bn1-bn2/fuel-system/fuel-pump-electronic-dual-polarit=
y-bn1-bn4-mg-tf-mga-mgb-to-64.html">http://www.bpnorthwest.com/austin-heale=
y/bn1-bn2/fuel-system/fuel-pump-electronic-dual-polarity-bn1-bn4-mg-tf-mga-=
mgb-to-64.html</a></div><div aria-label=3D"Compose body"><br></div><div ari=
a-label=3D"Compose body">NFI, and I've never used one.<br></div><div aria-l=
abel=3D"Compose body"><br></div><div aria-label=3D"Compose body">Bob<br></d=
iv><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:nor=
mal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans=
-serif;font-size:12pt;" data-mce-style=3D"color: #000; font-weight: normal;=
font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sa=
ns-serif; font-size: 12pt;"><br><div><br></div>My car had a generic 'modern=
' plastic pump which worked fine but isn't<br>quite kosher so I got a new S=
U pump from Burlen and that is where I<br>discovered the diaphragm issue. I=
t really does let quite a bit of<br>petrol smell through- enough for me to =
take it apart and look for the<br>leak. Burlen sent a replacement diaphragm=
which is, of course, no<br>better.<br><div><br></div>If you have a used 60=
year old triple layer diaphragm for sale I'd be<br>interested in upgrading=
my new one!<br><div><br></div>The best design I have seen is an Italian co=
py that had a single layer<br>clear plastic diaphragm and also a plastic to=
ggle inside the points<br>which is so much simpler than the mousetrap. Been=
in a Bn2 for longer<br>than I have been alive and only needed a replacemen=
t inlet fibre<br>sealing washer to stop a leak.<br><div><br></div>Andy.<br>=
<div><br></div>On 11/23/16, Oudesluys <coudesluijs@chello.nl> wrote:<=
br>> I have not come across the single layer diaphragms. I have seen off=
ered<br>> on ebay new dual layer ones from China and the UK. So far I ha=
ve had<br>> enough scrap pumps of the wrong type to provide enough good =
triple layer<br>> diaphragms for the ones that were fit for a rebuild as=
the so called<br>> High Pressure type I want, AUF301 or W/AZX1307/8 or =
equivalent, so I<br>> have no experience with the modern replacements.<b=
r>> The permeation of petrol will probably very, very little if any, so =
I<br>> would not worry about it. Some modern rubbers withstand all fuels=
and so<br>> as long as these are used it will probably be OK. Time will=
tell. Anyway<br>> the pumps cast iron coil housing and the space on top=
under the bakelite<br>> cap over the points assembly is vented.<br>>=
As the old triple layer diaphragms seem to last for ever I would not<br>&g=
t; replace them other then when they have become hard and cracked or when<b=
r>> the thin plastic membrane that keeps the petrol away from the rubber=
is<br>> damaged.<br>> Kees Oudesluijs<br><br><div><br></div></div><d=
iv><br></div></div></body></html>
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