Subject: [Healeys] Confusing fuel starvation--BJ8

From: Tom Felts <[email-masked]>
Date: Sun, 16 Oct 2016 18:07:22 -0400

Thought I had found why I was getting fuel starvation.  I would be driving along and the engine wanten to die---flip the acc and pull the choke and it wold fire up again---did this over and over to nurse the car home.

Since the fuel pup was operating as it should, I figured it must be in a carb.  

Took the tops off the fuel bowl.  Rea was full of gas-----front only 1/2 way up.

Looked at the Grose jet and it seemed to be sticking===pulled it cleaned it----and broke the tip off.

Had another original jet so installed it---thought that was it.

Started it up and same symptoms.

What next??  Anyn ideas?

tom
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From: Tom Felts <[email-masked]>
Date: Mon, 17 Oct 2016 8:52:08 -0400

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 <[email-masked]> wrote: 

=============
Ping pong ball in fuel tank?

Ira Erbs

[email-masked]

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From: [email-masked]
Date: Mon, 17 Oct 2016 13:58:48 +0000 (UTC)

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Tom,

The design of the union on the carbs is such that the carb first in the sup=
ply line will hog fuel from the 2nd carb when delivery is limited.=20

First do a delivery volume check from the union at the 2nd carb. Then compa=
re that to the same check to the first carb.=20

I=C2=A0 suspect that you will find that total supply is insufficient.=20

Michael S=20

BN1 #174

On Mon, Oct 17, 2016 at 9:47 AM -0400, "Tom Felts" <[email-masked]=
> wrote:

If there were debris in the tank it would clog up the intake line and the p=
ump 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 i=
sn't getting its' supply.

BTW---the front one has one of those composite type floats in  it.  Not sur=
e if it has any effect??

---- i erbs  wrote:=20

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Ping pong ball in fuel tank?

Ira Erbs

[email-masked]

[email-masked]

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<html><head></head><body><p dir="auto" style=" text-align: left; margin-top: 25px; margin-bottom: 25px; font-family: sans-serif; font-size: 11pt; color: black; background-color: white ">Tom,<br>
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. <br>
First do a delivery volume check from the union at the 2nd carb. Then compare that to the same check to the first carb. <br>
I&nbsp; suspect that you will find that total supply is insufficient. <br>
Michael S <br>
BN1 #174<br></p>
<br><br><br>
<div class="gmail_quote">On Mon, Oct 17, 2016 at 9:47 AM -0400, "Tom Felts" <span dir="ltr">&lt;<a href="mailto:[email-masked]" target="_blank">[email-masked]</a>&gt;</span> wrote:<br>
<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div dir="3D&quot;ltr&quot;">
<pre>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.

=============

Ira Erbs

[email-masked]

</[email-masked]></pre>
</div>

</blockquote>
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From: Tom Felts <[email-masked]>
Date: Mon, 17 Oct 2016 16:38:18 -0400

accelerator-and by flip i'm talking fast pumping.

---- Bob Spidell <[email-masked]> wrote: 

=============
What is an 'acc' and how does one flip it? 

bs 

[email-masked]

---

From: Michael Salter <[email-masked]>
Date: Mon, 17 Oct 2016 17:09:03 -0400

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--001a114002f25b2dea053f15fc7c

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 <[email-masked]> 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
> ---- [email-masked] 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" <
> [email-masked]> 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.
>
> ---- i erbs  wrote:
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
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> Unsubscribe/Manage: http://autox.team.net/mailman/
> options/healeys/[email-masked]
>
>
>
>
>
>
>
>

-- 
*If you can't fix it with a hammer, you've got an electrical problem.*

--001a114002f25b2dea053f15fc7c
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Tom,<br></div><div class=3D"gmail_defa=
ult" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Still t=
rying to figure this out.<br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">You said &quot;Rea was =
full of gas-----front only 1/2 way up.&quot;<br></div><div class=3D"gmail_d=
efault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Well=
 in my experience the needle valve closes when the fuel level is the equiva=
lent about 1/2 way when the float is removed. <br></div><div class=3D"gmail=
_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small">My=
 method of checking float levels is a little unorthodox but pretty accurate=
.<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,=
sans-serif;font-size:small">Presuming that the carbs are not so hot that th=
e float chambers are boiling, shut off the ignition when the engine is runn=
ing badly and coast to a stop.<br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">Remove both sucti=
on 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 b=
ridge the fuel level actually is. <br></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small">The only times=
 that I have encountered a significant difference in the levels is when the=
re 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 fu=
el hose had somehow got past the filter gauze and jammed the needle valve o=
pen.<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans =
ms,sans-serif;font-size:small">In my experience a 2 carb engine running on =
one carb displays very distinctive symptoms. Usually idles fine, although s=
lowly, and can actually be driven quite satisfactorily albeit significantly=
 down on power. <br></div><div class=3D"gmail_default" style=3D"font-family=
:comic sans ms,sans-serif;font-size:small">If the throttle plate is still o=
pening the loss of power is more apparent.<br></div><div class=3D"gmail_def=
ault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Michae=
l S<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans m=
s,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">=C2=A0<br></div><=
/div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Oct =
17, 2016 at 4:42 PM, Tom Felts <span dir=3D"ltr">&lt;<a href=3D"mailto:tomf=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex">thanks Michael---but it is the =
first in line (front) that has the lesser fuel in it.=C2=A0 My fuel pup is =
very new and seems to be pumping as it should.=C2=A0 I can still check supp=
ly nthough.<br>
<br>
thanks<br>
tom<br>
---- <a href=3D"mailto:[email-masked]">[email-masked]</=
a> wrote:<br>
<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
Tom,<br>
<br>
The design of the union on the carbs is such that the carb first in the sup=
ply line will hog fuel from the 2nd carb when delivery is limited.<br>
<br>
First do a delivery volume check from the union at the 2nd carb. Then compa=
re that to the same check to the first carb.<br>
<br>
I=C2=A0 suspect that you will find that total supply is insufficient.<br>
<br>
Michael S<br>
<br>
BN1 #174<br>
<br>
<br>
<br>
<br>
<br>
On Mon, Oct 17, 2016 at 9:47 AM -0400, &quot;Tom Felts&quot; &lt;<a href=3D=
"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
If there were debris in the tank it would clog up the intake line and the p=
ump would be working overtime to try to get fuel to the carbs---this isn&#3=
9;t happening.=C2=A0 Plenty of fuel getting to the rear carb----just the fr=
ont one isn&#39;t getting its&#39; supply.<br>
<br>
BTW---the front one has one of those composite type floats in=C2=A0 it.=C2=
=A0 Not sure if it has any effect??<br>
<br>
<br>
---- i erbs=C2=A0 wrote:<br>
<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
Ping pong ball in fuel tank?<br>
<br>
Ira Erbs<br>
<br>
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</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><d=
iv><div dir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you =
can&#39;t fix it with a hammer, you&#39;ve got an electrical problem.</span=
></font></i><br><br><div></div><div></div><div></div></div></div></div></di=
v>
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From: [email-masked]
Date: Tue, 18 Oct 2016 10:20:01 -0400

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Tom, 
You indicated that you have an intermittent problem which appears to be a fuel delivery issue to the front carb. 
You need to check/test/inspect the following:
Is the fuel flow to the front carb unobstructed for any reason? Some SU carbs have a fine screen filter in the inlet to the carb (before float bowl). Is it there & is it restricted?
Are all the carb heat shields in place? 
Is the front float floating or is it partially submerged in fuel. You mentioned that it was a "composite" material.   
Is the float & needle (float) valve correctly adjusted to maintain the proper fuel level in the bowl?
is the float needle valve working freely & correctly?
Are both of the carbs correctly adjusted rich/lean & synchronized? 
Does the choke completely release (disengage) when the knob is pushed to the off position on the dash. 
Are there any modifications to the car that might affect the fuel delivery/ignition that you haven't mentioned? 
Gary 

[email-masked]

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<font color='black' size='2' face='arial'>
<div>Tom, </div>

<div>You indicated that you have an intermittent problem which appears to be a fuel delivery issue to the front carb. </div>

<div>You need to check/test/inspect the following:</div>

<div>Is the fuel flow to the front carb unobstructed for any reason? Some SU carbs have a fine screen filter in the inlet to the carb (before&nbsp;float bowl). Is it there &amp; is it restricted?</div>

<div>Are all the carb heat shields in place? </div>

<div>Is the front float floating or is it partially submerged in fuel. You mentioned that it was a "composite" material. &nbsp;&nbsp;</div>

<div>Is the float &amp; needle (float) valve&nbsp;correctly adjusted to maintain the proper fuel level in the bowl?</div>

<div>is the float needle valve working freely &amp; correctly?</div>

<div>Are both of the carbs correctly adjusted rich/lean &amp; synchronized? </div>

<div>Does the choke completely release (disengage) when&nbsp;the knob is pushed to the&nbsp;off position on the&nbsp;dash.&nbsp;</div>

<div>Are there any modifications to the car that might affect the fuel delivery/ignition that you haven't mentioned?&nbsp;</div>

<div>Gary&nbsp;</div>

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