[Healeys] Not Healey, but Related British Car Stuff

Tue Jan 12 11:00:27 MST 2021

If you are replacing the fuel pump go back to the original: SU AUF301 or 
the modern equivalent Burlen/SU AZX1308. These pumps deliver the correct 
flow and pressure (3,8psi). The AZX 1307 is often offered as a suitable 
replacement, it is NOT as the delivery pressure is too low at 2,7psi. 
The AUF 301 may be 303 or 305, there seems to be a few variations here, 
the difference is possibly in the fuel line connections.  You can go for 
one of the two electronic versions, one with a magnet, the other optical 
thus avoiding failure of the contact points. I would prefer the points 
type as there is always a possibility to repair it at the road side, 
being very simple in operation and the electronic versions may not have 
a fantastic reliability record or so it seems. The points type is very 
reliable under one condition: /regular use!! /

The best is an old properly rebuilt pump with the old 3-ply diaphragm.

Kees Oudesluijs

Op 12-1-2021 om 17:46 schreef Michael MacLean:
> The fuel pump is screwed to the floor just above the rear axle on the 
> side opposite the exhaust pipe.  The only part of the fuel feed system 
> near any heat is where the steel line enters the engine bay.  The fuel 
> pump itself is a square facet type.  It is larger physically than the 
> Facet in my Bugeye and appears to have been installed quite a while 
> ago by the looks of it.  After my inspection yesterday just to see 
> what kind of pump I had i started the car up for the first time since 
> going to In n Out a few days ago.  Immediately after startup it idled 
> a little over 500 rpm. Since I bought the car 7 months ago startup has 
> always been followed by an idle of 1000 rpm+. I attribute this high 
> idle to the Weber carb and the difficulty tweaking it with the correct 
> jets and adjustments.  I have put together a set of HS6 SU carbs to 
> replace the Weber.  I'm leaning toward a fuel pump failure so far.
> Mike MacLean
>
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>
>     On Tue, Jan 12, 2021 at 6:21 AM, john harper
>     <ah100tech at gmail.com> wrote:
>     Chris
>
>     I agree but there is still the problem with the pump and petrol
>     feed being close to the hot exhaust silencer and pipe.
>
>     I assume that this why the pipe was routed to the right-hand side
>     of the chassis on later 3000
>
>     Keep well
>
>     On Tue, 12 Jan 2021 at 12:41, Chris Dimmock
>     <austin.healey at gmail.com <mailto:austin.healey at gmail.com>> wrote:
>
>         Is your fuel pump in the engine bay, or at the back, under the
>         guard, near the tank?
>         Pressurized fuel (where the pump is back near the tank) can
>         tolerate engine bay heat far better than non pressurized fuel.
>         As long as the pump isn’t heated, (next to e.g. the exhaust)
>         it’s good.
>         And as long as the fuel is pressurized in the fuel line, it’s
>         fine as well.
>         The problem is when you put the fuel pump in the engine bay,
>         and that means the fuel in the line before the pump isn’t
>         pressurized, and the pump is trying to cope with engine bay
>         temps..
>         and guess what!!!!
>         Bazinga!!
>         😀
>
>         > On 12 Jan 2021, at 11:46 am, Michael MacLean
>         <rrengineer.mike at att.net <mailto:rrengineer.mike at att.net>> wrote:
>
>         >
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