[Roadsters] fuel gauge troubleshooting

[Krismon ongbongan]

>From all the way back in October!  I finally got to it this week..

popped the access panel off in the trunk.. and there it was! a
dangling yellow wire. wasn't snapped in place properly after I had the
tank out to be resealed last summer, I guess... that's why sometimes
it worked, sometimes it didn't, then eventually fell off altogether.

I did check the wire direct to ground before I put it back in place,
and it moves all the way up.

That said.. when full, it still shows 1/4 tank on the gauge.. since
the tank is full, there's a bit of driving ahead of me before I can
pull the sender out to check it.

Thanks for all the tips.

Kris.

On Thu, Oct 13, 2011 at 10:30 PM, Gary and Cindy Ault <aultgc at att.net> wrote:
> Krismon,
>
> Get wiring diagram from 311s.org website, then check all connections and
> grounds.  If temperature gauge works, the problem is probably in the wiring
> from the gauge through the sender to ground, or the sender.  You can pull
> the sender via the access panel in the trunk floor and check its operation.
>
> I am told that the standard for the fuel sending unit is 83 ohms +/_ empty
> and 12 ohms +/- Full.  If you do choose to remove the sender, be careful
not
> to damage the exposed resistor windings.
>
> I have run the wiring on my fuel gauge from the 12 volt source through the
> gauge to the sender to ground, and haven't been able to get the temp and
> fuel gauges working again.  So, patience.
>
> Gary
>
> ----- Original Message ----- From: "Krismon ongbongan"
> <krismon at ongbongan.com>
> To: "roadster list" <datsun-roadsters at autox.team.net>
> Sent: Thursday, October 13, 2011 7:29 PM
> Subject: [Roadsters] fuel gauge troubleshooting
>
>
>> any tips on troubleshooting the fuel gauge on my '69.
>>
>> background:
>> oil pressure, temp gauge works.. ammeter is unhooked (presumably from a
>> motor swap years ago).
>> It did "work" when I got the car earlier this year.. a Full tank showed as
>> 1/4, now the needle doesn't even move... swapped out a voltage regulator a
>> couple of months back (with one from a 510) when the temp gauge & oil
>> pressure stopped moving.. but fuel gauge never came back.
>> I did have the tank pulled out to be refurbished this past spring, too...
>>
>> So..now the question.. how do I tell whether it's the sender or the gauge?
>> easy way to probe with a multimeter?
>>
>> Kris.
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