Patton -
Overflowing fuel in the carbs is typically caused only
by three things:
1) Bad Float. If your carb float in the bowl has a
hole in it, it will not push with enough force on the
float jet to shut off the flow of fuel when the bowl
is empty. This is easily checked by removing the
float and seeing if it weighs too much... or if you
shake it you should hear the fuel inside the float
itself. If you hear that... you need a new float!
2) Bad Float Jet / crud in the system. If you have
Grose Jets... throw them away, that's probably your
problem. If you are using standard SU float jets,
take them out and make sure all the holes in the float
chamber lid are free of dirt and crud. Replace the SU
float jets with new ones while you are at it. Use an
inline fuel filter.
3) Too much pressure from the fuel pump. Your fuel
pump should not have more than about 3 PSI in
pressure, prefferably 1.5-2 PSI in pressure. If
you've replaced the original pump with a FACET pump or
some other pump, it has to be a low pressure variety.
If it is high pressure type, it will force the float
jets open all the time and overflow.
Regards,
Alan
'53 BN1 '64 BJ8
--- Patton Dickson <kpdii@earthlink.net> wrote:
> OK, I am about ready to throw these _____'ing H4
> carbs out the window. I
> cannot get the front carb to stop overflowing from
> the nut on top of the
> float bowl lid. What's frustrating is that I was
> planning on talking it to
> the Houston All British show this coming weekend,
> and the car is running
> fine with the exception of the leak.
>
> I know that this is an operator problem, and I am
> not getting something
> right, so think I need to send these off to a pro
> before I pull a DPO move.
> Who have you guys used for rebuilds, especially for
> SU H series carbs?
>
> I miss the Sprite and MGB's HS's, they seemed
> significantly easier to set
> up.
>
> Thanks
> Patton
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