[Healeys] Confusing fuel starvation--BJ8

[Michael Salter]

Hi Tom,
Still trying to figure this out.
You said "Rea was full of gas-----front only 1/2 way up."
Well in my experience the needle valve closes when the fuel level is the
equivalent about 1/2 way when the float is removed.
My method of checking float levels is a little unorthodox but pretty
accurate.
Presuming that the carbs are not so hot that the float chambers are
boiling, shut off the ignition when the engine is running badly and coast
to a stop.
Remove both suction chambers and the piston and needle then use a small
twig or even a pine needle and dip it down through the jet to determine how
far down from the bridge the fuel level actually is.
The only times that I have encountered a significant difference in the
levels is when there was problem with the pump, the float had sunk (in that
case fuel flowed out of the jet with the ignition on), or a piece of rubber
from a frayed fuel hose had somehow got past the filter gauze and jammed
the needle valve open.
In my experience a 2 carb engine running on one carb displays very
distinctive symptoms. Usually idles fine, although slowly, and can actually
be driven quite satisfactorily albeit significantly down on power.
If the throttle plate is still opening the loss of power is more apparent.
Michael S



On Mon, Oct 17, 2016 at 4:42 PM, Tom Felts <tomfelts at windstream.net> wrote:

> thanks Michael---but it is the first in line (front) that has the lesser
> fuel in it.  My fuel pup is very new and seems to be pumping as it should.
> I can still check supply nthough.
>
> thanks
> tom
> ---- michael.salter at gmail.com wrote:
>
> =============
>
>
> Tom,
>
> The design of the union on the carbs is such that the carb first in the
> supply line will hog fuel from the 2nd carb when delivery is limited.
>
> First do a delivery volume check from the union at the 2nd carb. Then
> compare that to the same check to the first carb.
>
> I  suspect that you will find that total supply is insufficient.
>
> Michael S
>
> BN1 #174
>
>
>
>
>
> On Mon, Oct 17, 2016 at 9:47 AM -0400, "Tom Felts" <
> tomfelts at windstream.net> wrote:
>
>
>
>
>
>
>
>
>
>
> If there were debris in the tank it would clog up the intake line and the
> pump would be working overtime to try to get fuel to the carbs---this isn't
> happening.  Plenty of fuel getting to the rear carb----just the front one
> isn't getting its' supply.
>
> BTW---the front one has one of those composite type floats in  it.  Not
> sure if it has any effect??
>
>
> ---- i erbs  wrote:
>
> =============
> Ping pong ball in fuel tank?
>
> Ira Erbs
>
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-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
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