Subject: Re: [Healeys] Fuel gauge damper query

From: Michael Salter <[email-masked]>
Date: Sun, 3 Feb 2019 22:42:17 -0500

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Hi Simon,
The statement "I believe that any energy storage device near petrol vapour
is extremely dangerous." is probably quite true but whether the capacitor
is connected at the gauge or the sender unit does not, IMHO, make an iota
of difference.
The discharge from the capacitor would travel from the gauge to the tank in
about 0.00000001 of a millisecond and it's doubtful that it would have
diminished very much during the journey. Having seen the petrol tank of an
upright Ford Prefect explode in spectacular fashion about 45 years ago I
can assure you that I'm really nervous about this type of modification.
I think this
<http://www.netbug.net/blogmichael/2015/09/06/smiths-and-jaegar-fuel-gauge-=
solution/>
is probably a lot safer but if I was to be doing another I might even use a
light weight braided wire rather than the coiled brass.

M

On Sun, Feb 3, 2019 at 8:33 PM <[email-masked]> wrote:

> Hi,
>
> See the attached. I can=E2=80=99t recall whose work I was pirating, but I=
 was
> interested in it anyway. The latter two paragraphs were added by me after
> consulting with you guys.
>
> So, in the end, I got around to trying it myself. I bought this:- eBay
> item:-  152332450334
>
> It wasn=E2=80=99t hard to fit and in it went=E2=80=A6..
>
> Now, I know less  about capacitors and milliwotsits than I do about
> kiloton yields and so I just bought what seemed closest to the spec on th=
e
> original article.
>
> Results? Well, it was a success in a way. The needle didn=E2=80=99t bounc=
e around
> but it was so damped that it moved like a glacier on a cold day. It did g=
et
> up to where it should be, but took, quite literally, 5 minutes to do so.
> All good connections, all per the diagram. Gauge working fine before and
> after.
>
> So=E2=80=A6=E2=80=A6.I suppose that I bought the wrong thing. Can anybody=
 be very kind and
> tell me *precisely *what I should have bought? All the clever little
> numbers and symbols. I don=E2=80=99t have to understand it; I just have t=
o fit it.
>
> And, before you all shout at once, I have Michael=E2=80=99s alternative i=
n mind
> and will probably finish with it as a permanent fix. It=E2=80=99s just th=
at I can=E2=80=99t
> bear to be beaten by a tuppeny-happeny capacitor.
>
> Thank you,
>
> Simon
>
>
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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:comic sans ms,sans-serif;font-size:small">Hi Simon, <br></div><div=
 class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">The statement <span style=3D"color:rgb(0,0,255)">&quot;I belie=
ve that any energy storage device near petrol vapour is extremely dangerous=
.&quot; <font color=3D"#000000">is probably quite true but whether the capa=
citor is connected at the gauge or the sender unit does not, IMHO, make an =
iota of difference. <br></font></span></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small"><span style=3D=
"color:rgb(0,0,255)"><font color=3D"#000000">The discharge from the capacit=
or would travel from the gauge to the tank in about 0.00000001 of a millise=
cond and it&#39;s doubtful that it would have diminished very much during t=
he journey. Having seen the petrol tank of an upright Ford Prefect explode =
in spectacular fashion about 45 years ago I can assure you that I&#39;m rea=
lly nervous about this type of modification.</font></span></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small"><span style=3D"color:rgb(0,0,255)"><font color=3D"#000000">I think <=
a href=3D"http://www.netbug.net/blogmichael/2015/09/06/smiths-and-jaegar-fu=
el-gauge-solution/">this</a> is probably a lot safer but if I was to be doi=
ng another I might even use a light weight braided wire rather than the coi=
led brass.</font></span></div><div class=3D"gmail_default" style=3D"font-fa=
mily:comic sans ms,sans-serif;font-size:small"><span style=3D"color:rgb(0,0=
,255)"><font color=3D"#000000"><br></font></span></div><div class=3D"gmail_=
default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"><sp=
an style=3D"color:rgb(0,0,255)"><font color=3D"#000000">M</font></span><br>=
</div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"=
gmail_attr">On Sun, Feb 3, 2019 at 8:33 PM &lt;<a href=3D"mailto:simon.lach=
[email-masked]">[email-masked]</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-G=
B"><div class=3D"gmail-m_-1582504481031511528WordSection1"><p class=3D"MsoN=
ormal">Hi,<u></u><u></u></p><p class=3D"MsoNormal">See the attached. I can=
=E2=80=99t recall whose work I was pirating, but I was interested in it any=
way. The latter two paragraphs were added by me after consulting with you g=
uys.<u></u><u></u></p><p class=3D"MsoNormal">So, in the end, I got around t=
o trying it myself. I bought this:- eBay item:- =C2=A0152332450334<u></u><u=
></u></p><p class=3D"MsoNormal">It wasn=E2=80=99t hard to fit and in it wen=
t=E2=80=A6..<u></u><u></u></p><p class=3D"MsoNormal">Now, I know less=C2=A0=
 about capacitors and milliwotsits than I do about kiloton yields and so I =
just bought what seemed closest to the spec on the original article.<u></u>=
<u></u></p><p class=3D"MsoNormal">Results? Well, it was a success in a way.=
 The needle didn=E2=80=99t bounce around but it was so damped that it moved=
 like a glacier on a cold day. It did get up to where it should be, but too=
k, quite literally, 5 minutes to do so. All good connections, all per the d=
iagram. Gauge working fine before and after.<u></u><u></u></p><p class=3D"M=
soNormal">So=E2=80=A6=E2=80=A6.I suppose that I bought the wrong thing. Can=
 anybody be very kind and tell me <u>precisely </u>what I should have bough=
t? All the clever little numbers and symbols. I don=E2=80=99t have to under=
stand it; I just have to fit it.<u></u><u></u></p><p class=3D"MsoNormal">An=
d, before you all shout at once, I have Michael=E2=80=99s alternative in mi=
nd and will probably finish with it as a permanent fix. It=E2=80=99s just t=
hat I can=E2=80=99t bear to be beaten by a tuppeny-happeny capacitor.<u></u=
><u></u></p><p class=3D"MsoNormal">Thank you,<u></u><u></u></p><p class=3D"=
MsoNormal">Simon<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></=
u></p></div></div>_______________________________________________<br>
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From: [email-masked]
Date: Sun, 03 Feb 2019 22:46:23 -0800

Here are two thoughts, Simon,

First, you most likely won't be consuming petrol so fast that a five
minute lag in display would cause trouble.

Second, you don't tell us what size cap you got, 1 farad?  5 farads?
or what?  If you got one that was half the size, say 1 farad instead
of 2, the gauge should respond twice as fast, or half as slow -- take
your pick.

-Roland

On Mon, 4 Feb 2019 00:07:25 -0000, you wrote:

>Hi,
>
>See the attached. I can't recall whose work I was pirating, but I was
>It wasn't hard to fit and in it went...
>
>Now, I know less  about capacitors and milliwotsits than I do about kiloton
>yields and so I just bought what seemed closest to the spec on the original
>article.
>
>Results? Well, it was a success in a way. The needle didn't bounce around
>but it was so damped that it moved like a glacier on a cold day. It did get
>up to where it should be, but took, quite literally, 5 minutes to do so. All
>good connections, all per the diagram. Gauge working fine before and after.
>
>So...I suppose that I bought the wrong thing. Can anybody be very kind and
>tell me precisely what I should have bought? All the clever little numbers
>and symbols. I don't have to understand it; I just have to fit it.
>
>And, before you all shout at once, I have Michael's alternative in mind and
>will probably finish with it as a permanent fix. It's just that I can't bear
>to be beaten by a tuppeny-happeny capacitor.
>
>Thank you,
>
>Simon
>
> 

[email-masked]

---

From: <[email-masked]>
Date: Mon, 4 Feb 2019 11:43:10 -0000

Hi,
Thank you all for the advice. The eBay number takes one to a 4.4f unit.
Apparently I need 1f. I gather that will create 4.4 times less damping.
Makes sense. Still be a bit slow I'd think.
The thing costs pennies. I'll give it a shot.
Simon

-----Original Message-----
From: [email-masked] <[email-masked]> 
Sent: 04 February 2019 06:46
To: [email-masked]
Cc: Healeys <[email-masked]>
Subject: Re: [Healeys] Fuel gauge damper query

First, you most likely won't be consuming petrol so fast that a five minute
lag in display would cause trouble.

Second, you don't tell us what size cap you got, 1 farad?  5 farads?
or what?  If you got one that was half the size, say 1 farad instead of 2,
the gauge should respond twice as fast, or half as slow -- take your pick.

-Roland

On Mon, 4 Feb 2019 00:07:25 -0000, you wrote:

>interested in it anyway. The latter two paragraphs were added by me 
>after consulting with you guys.
>
>kiloton yields and so I just bought what seemed closest to the spec on 
>the original article.
>
>Results? Well, it was a success in a way. The needle didn't bounce 
>around but it was so damped that it moved like a glacier on a cold day. 
>It did get up to where it should be, but took, quite literally, 5 
>minutes to do so. All good connections, all per the diagram. Gauge working
fine before and after.
>
>So...I suppose that I bought the wrong thing. Can anybody be very kind 
>and tell me precisely what I should have bought? All the clever little 
>numbers and symbols. I don't have to understand it; I just have to fit it.
>
>And, before you all shout at once, I have Michael's alternative in mind 
>and will probably finish with it as a permanent fix. It's just that I 
>can't bear to be beaten by a tuppeny-happeny capacitor.
>
>Thank you,
>
>Simon
>
> 

[email-masked]

---

From: Bob Spidell <[email-masked]>
Date: Mon, 4 Feb 2019 07:59:01 -0800

That eBay item# shows zero results for me.  You almost certainly want a 
capacitor rated in microfarads: µF.

Bob

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