[Healeys] Fuel pump

[Michael Salter]

The coil should have a resistance around 3 - 5 ohms Richard. I have had bad
ones that still work (poorly) with less than 2 ohms.

M

On Thu, Feb 5, 2026 at 11:02 AM Richard Mayor <boyracer466 at gmail.com> wrote:

> I believe I have just such a weakened pump. New points, clean and supple
> diaphragm, works fine on bench with no fuel, once working with fuel it
> slows down and stops.  I have adjusted the stroke up and down with always
> the same result.  I always suspected there was something amiss with the
> coil. How do I test it to confirm that is the issue?
>
>
> Sent from my iPad
>
> On Feb 4, 2026, at 7:37 PM, Michael Salter via Healeys <
> healeys at autox.team.net> wrote:
>
> 
> One thing about the SU type of fuel pump which is often misunderstood is
> what happens to the pump in the event that the inlet becomes blocked. In
> that situation the low pressure on the inlet side of the diaphragm prevents
> the armature from rising and the points from opening.  This means that
> current continues to pass through the coil until sufficient fuel passes
> into the pump through the blockage to allow the diaphragm to rise and the
> points to open. This causes the coil to overheat and become weakened.
> If you are trying to rebuild a pump and the "tick, tick" seems rather
> anemic it is likely that a damaged and weakened coil is very the cause.
> Hopefully this will save people from wasting time in this situation.
>
> M
>
>
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Al Fuller
> via Healeys <healeys at autox.team.net>
> *Sent:* Wednesday, February 4, 2026 7:58:09 PM
> *To:* Jean Caron <vintage_roadster_restoration at hotmail.com>
> *Cc:* healeys <Healeys at autox.team.net>
> *Subject:* Re: [Healeys] Fuel pump
>
> Pulling out the pump and checking on the bench might be in order.
>
> As to the weather, it's just getting to be driving season here in the
> desert. :)
>
> ________________
> Sent from my phone
> Best Regards,
> Al Fuller
>
> On Tue, Feb 3, 2026, 3:23 PM Jean Caron <
> vintage_roadster_restoration at hotmail.com> wrote:
>
> It is February, take it out and rebuild it.
>
> Jean
>
> Sent from my Bell Samsung device over Canada’s largest network.
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Fred Wescoe
> <fredwescoe at gmail.com>
> *Sent:* Tuesday, February 3, 2026 4:02:17 PM
> *To:* healeys <Healeys at autox.team.net>
> *Subject:* [Healeys] Fuel pump
>
> Listers,
>
> I have the standard SU fuel pump on my 66 BJ8.  It was rebuilt several
> years ago and the car ran with the pump with no problems.
>
> The car has been sitting for about 8 months now and the pump will not run.
>
> I have tried smacking the pump with a rubber hammer but no joy.  Is there
> another way to get the pump started without removing it and opening it up?
>
> As always, thanks in advance for your help.
>
> Fred
>
> 66 BJ8
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