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Terry -
Here is an excellent write-up on testing and repair of the system:
http://mgaguru.com/mgtech/electric/fg_01.htm
It is for an MGA but equally applicable to our TR3As.
Geo
On Thu, Aug 20, 2015 at 2:21 PM, <terryrs@comcast.net> wrote:
>
> So, the fuel guage works when I fill the tank. Registers full. Then,
> right about 3/4ths of a tank left, it wobbles, then drops to zero.
>
> Voltage at the sending unit is 12 in and a bit over 4 out. Voltage at the
> gauge is the same. Both measurements at the 3/4ths level.
>
> I would guess that the sending unit is simply a variable resister,
> somewhat like the heater fan switch. I would think that the resistance
> wire that the float rides on might be broken at that one particular point.
> ...Except I'm getting 4 volts being sent to the gauge.
>
> Am I right that the gauge is faulty? I don't understand gauges, and why
> they might malfunction at one particular reading (and all subsequent until
> the gas tank is empty).
>
> Thoughts?
>
> Terry Smith, '59 TR3A
> New Hampshire
>
> ** triumphs@autox.team.net **
>
> Donate: http://www.team.net/donate.html
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<div dir=3D"ltr"><div>Terry -</div><div><br></div><div>Here is an excellent=
write-up on testing and repair of the system:</div><div><br></div><div><a =
href=3D"http://mgaguru.com/mgtech/electric/fg_01.htm";>http://mgaguru.com/mg=
tech/electric/fg_01.htm</a></div><div><br></div><div>It is for an MGA but e=
qually applicable to our TR3As.</div><div><br></div><div>Geo</div></div><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Aug 20, 2015=
at 2:21 PM, <span dir=3D"ltr"><<a href=3D"mailto:terryrs@comcast.net"; =
target=3D"_blank">terryrs@comcast.net</a>></span> wrote:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><br>
So, the fuel guage works when I fill the tank.=C2=A0 Registers full.=C2=A0 =
Then, right about 3/4ths of a tank left, it wobbles, then drops to zero.<br=
>
<br>
Voltage at the sending unit is 12 in and a bit over 4 out.=C2=A0 Voltage at=
the gauge is the same.=C2=A0 Both measurements at the 3/4ths level.<br>
<br>
I would guess that the sending unit is simply a variable resister, somewhat=
like the heater fan switch.=C2=A0 I would think that the resistance wire t=
hat the float rides on might be broken at that one particular point.=C2=A0 =
...Except I'm getting 4 volts being sent to the gauge.<br>
<br>
Am I right that the gauge is faulty?=C2=A0 I don't understand gauges, a=
nd why they might malfunction at one particular reading (and all subsequent=
until the gas tank is empty).<br>
<br>
Thoughts?<br>
<br>
Terry Smith, '59 TR3A<br>
New Hampshire<br>
<br>
** <a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a> *=
*<br>
<br>
=3D"noreferrer">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive"; target=3D"_blank" rel=3D"n=
oreferrer">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums"; target=3D"_blank" rel=3D"nor=
eferrer">http://www.team.net/forums</a><br>
hs/ahwahneetr@gmail.com" target=3D"_blank" rel=3D"noreferrer">http://autox.=
team.net/mailman/options/triumphs/ahwahneetr@gmail.com</a><br>
</blockquote></div><br></div>
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