[Healeys] BN2 Fuel Pump

[Alan Seigrist]

Bob -

I can't say offhand because my BN1 has had a KIWI plastic pump on it
since I bought the car.

That being said, here's a breakdown of your pump online:

http://www.sucarb.co.uk/SUpumpClassic.aspx?ProductId=26731

Do the parts match?

Alan



On Sun, Sep 5, 2010 at 9:27 AM, Bob Spidell <bspidell at comcast.net> wrote:
> Listers,
>
> I'm most familiar with BJ8 fuel pumps--being able to assemble at least two
working units out of a large collection of parts at any given time--but I'm
having trouble with a BN2 fuel pump. The BJ8 pumps have a valve body with two
thin reed-type valves--one on the suction side and one on the pressure side
(they are set up differently, of course, but I believe the valves are the
same). Anyway, my BJ8 pumps a few times when energized and settles into a
steady rhythm of a pump every 5-6 seconds with the engine not running. With
the engine running, the pump speeds up according to engine speed; a pump every
2-3 seconds at idle, a couple pumps a second during acceleration, and a steady
pump every 1-2 seconds at cruise. Very logical.
>
> Our BN2's pump--a brand new SU electronic--is a different design. There is
only one valve--a brass disk, basically--on the output side and nothing on the
suction/inlet side (it almost seems like it's supposed to siphon as much as
pump). This pump behaves erratically--it'll pump rapidly when the key comes
on, and seems to settle down but then starts pumping erratically. It pumps
almost continuously with the engine running--the engine runs fine, BTW--but
it's still an erratic continuous.
>
> Is this typical for the BN2 pump? It appears this design is way inferior to
the BJ8 pump design--in spite of the lovely brass machine work inside--and I'm
glad to see SU improved the design (and probably make it cheaper, to boot),
but it doesn't seem right to me. I haven't ruled out air leaks, but we've
checked, tightened, and checked and tightened again and nothing seems to
change. Not having a reverse-flow preventing valve on the inlet side just
don't seem right, somehow.
>
> All info, SWAGs, etc. accepted/appreciated.
>
> Bob
>
> --------------------------------
> Bob Spidell - San Jose, CA
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