Subject: Re: [Roadsters] Fuel indication issues

From: RWM via Datsun-roadsters <[email-masked]>
Date: Sat, 9 May 2020 16:57:20 -0400

Pat,

The black wire is zero (ground).

Guess I'll try to work my fingers up behind the gauge and check for continuity.

Thanks.

- Bob

> On May 9, 2020, at 16:53, Pat Horne <[email-masked]> wrote:
> 
> Bob,
> That sounds a bit off. The 7.6v on the yellow wire to ground is fine, but the black wire should be zero. 
> 
> When you ground the yellow wire to the body, the gauge should go to max. Sounds like you have a bad fuel gauge. Just to be sure you can try grounding the terminal on the gauge that the yellow wire goes to. 
> 
> Peace,
> Pat
> 
> Pat Horne 
> We support Habitat for Humanity
> 
> 
>> On May 9, 2020, at 3:09 PM, RWM <[email-masked]> wrote:
>> 
> 
> Pat,
> 
> With ignition switch in running position
> 
> Yellow wire to chassis is 7.6 volts, same as to black wire
> 
> Yellow wire to ground, no gauge deflection 
> 
> Thanks
> 
> - Bob
> 
> 
>> On May 9, 2020, at 13:19, Pat Horne <[email-masked]> wrote:
>> 
>> Hook everything back up except the sender. Turn on the key & measure for voltage @ the sender wires to ground. One should show voltage & the other should be grounded. (Not home now to get colors) ground the one with voltage. If the gauge still sits on empty you have a bad gauge. If there is no voltage it could be a bad connection or a bad gauge. Let me know what y’all find & I’ll walk you through more diagnostics. 
>> 
>> Peace,
>> Pat
>> 
>> 
>> Pat Horne 
>> We support Habitat for Humanity
>> 
>> 
>>>>> On May 9, 2020, at 11:02 AM, RWM via Datsun-roadsters <[email-masked]> wrote:
>>> 
>> 
>> This has been discussed before, but here are the indications:
>> 
>> Fuel gauge does not budge off empty 
>> 
>> Fuel sender resistance shows 34 ohms as installed, with tank less than half full
>> 
>> Fuel sender resistance when removed varies fairly linearly from 47 ohms (bottom) to near zero ohms (near top), then open circuit when the arm forces the wiper off the rheostat windings
>> 
>> Fuel harness is delivering 7.6 volts, measured with the yellow and black connectors removed
>> 
>> Shorting the fuel harness to itself (yellow to black) does not change the fuel gauge indication
>> 
>> Ammeter works, temperature gauge works
>> 
>> Ideas? Dash harness connector?
>> 
>> Thanks.
>> 
>> - Bob Mann, '68 2000 Solex
>> 
>> 
>> ________________________________________
>> 
>> [email-masked]
>> 
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>> 
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>> 
>> 
> 

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---

From: mikelyons--- via Datsun-roadsters <[email-masked]>
Date: Mon, 11 May 2020 20:37:01 +0000 (UTC)

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I have the Nissan Service Manual for the SPL 310. The attached PDF is a cop=
y of the information concerning trouble shooting the fuel gauge and a wirin=
g diagram.

I hope it can be of help.

Mike Lyons
Vancouver, WA
1967 SPL 311 with 135 HP 2000
1967 1/2 SPL 311
1983 280ZX Turbo
=20
=20
=20
-----Original Message-----
From: RWM via Datsun-roadsters <[email-masked]>
To: Pat Horne <[email-masked]>
Cc: Datsun List <[email-masked]>
Sent: Sat, May 9, 2020 1:57 pm
Subject: Re: [Roadsters] Fuel indication issues

Pat,

Guess I'll try to work my fingers up behind the gauge and check for continu=
ity.

Thanks.

- Bob

>=20
> =EF=BB=BFBob,
> That sounds a bit off. The 7.6v on the yellow wire to ground is fine, but=
 the black wire should be zero.=20
>=20
> When you ground the yellow wire to the body, the gauge should go to max. =
Sounds like you have a bad fuel gauge. Just to be sure you can try groundin=
g the terminal on the gauge that the yellow wire goes to.=20
>=20
>=20
> Pat Horne=20
>=20
>=20
>>=20
>=20
> =EF=BB=BFPat,
>=20
>=20
>=20
> Yellow wire to ground, no gauge deflection=20
>=20
> Thanks
>=20
> - Bob
>=20
>=20
>>=20
>> =EF=BB=BFHook everything back up except the sender. Turn on the key & me=
asure for voltage @ the sender wires to ground. One should show voltage & t=
he other should be grounded. (Not home now to get colors) ground the one wi=
th voltage. If the gauge still sits on empty you have a bad gauge. If there=
 is no voltage it could be a bad connection or a bad gauge. Let me know wha=
t y=E2=80=99all find & I=E2=80=99ll walk you through more diagnostics.=20
>>=20
>>=20
>>=20
>> Pat Horne=20
>>=20
>>=20
>>>>> On May 9, 2020, at 11:02 AM, RWM via Datsun-roadsters <datsun-roadste=
[email-masked]> wrote:
>>>=20
>>=20
>> =EF=BB=BFThis has been discussed before, but here are the indications:
>>=20
>> Fuel gauge does not budge off empty=20
>>=20
>> Fuel sender resistance shows 34 ohms as installed, with tank less than h=
alf full
>>=20
>> Fuel sender resistance when removed varies fairly linearly from 47 ohms =
(bottom) to near zero ohms (near top), then open circuit when the arm force=
s the wiper off the rheostat windings
>>=20
>> Fuel harness is delivering 7.6 volts, measured with the yellow and black=
 connectors removed
>>=20
>> Shorting the fuel harness to itself (yellow to black) does not change th=
e fuel gauge indication
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> Archive: http://www.team.net/pipermail/datsun-roadsters http://autox.tea=
m.net/archive
>>=20
>> Unsubscribe: http://autox.team.net/mailman/options/datsun-roadsters/pati=
[email-masked]
>>=20
>>=20
>=20

Archive: http://www.team.net/pipermail/datsun-roadsters http://autox.team.n=
et/archive

Unsubscribe: http://autox.team.net/mailman/options/datsun-roadsters/mikelyo=
[email-masked]

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<div style=3D"color:black;font: 10pt arial;">I <font size=3D"2">have the Ni=
ssan Service Manual for the SPL 310. The attached PDF is a copy of the info=
rmation concerning trouble shooting the fuel gauge and a wiring diagram.<br=
<br>
I hope it can be of help.<br>
<br>
Mike Lyons<br>
Vancouver, WA<br>
1967 SPL 311 with 135 HP 2000<br>
1967 1/2 SPL 311<br>
1983 280ZX Turbo<br>
</font>
<div> <br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: RWM via Datsun-roadsters &lt;[email-masked]&gt;<br>
To: Pat Horne &lt;[email-masked]&gt;<br>
Cc: Datsun List &lt;[email-masked]&gt;<br>
Sent: Sat, May 9, 2020 1:57 pm<br>
Subject: Re: [Roadsters] Fuel indication issues<br>
<br>

<div dir=3D"ltr">Pat,<br clear=3D"none"><br clear=3D"none">The black wire i=
s zero (ground).<br clear=3D"none"><br clear=3D"none">Guess I'll try to wor=
k my fingers up behind the gauge and check for continuity.<br clear=3D"none=
"><br clear=3D"none">Thanks.<br clear=3D"none"><br clear=3D"none">- Bob<br =
clear=3D"none"><br clear=3D"none"><br clear=3D"none">
<div class=3D"yqt5933953826" id=3D"yqtfd68763"><br clear=3D"none">&gt; On M=
ay 9, 2020, at 16:53, Pat Horne &lt;<a shape=3D"rect" ymailto=3D"mailto:pat=
[email-masked]" href=3D"mailto:[email-masked]">patintexas@icloud=
.com</a>&gt; wrote:<br clear=3D"none">&gt; <br clear=3D"none">&gt; =EF=BB=
=BFBob,<br clear=3D"none">&gt; That sounds a bit off. The 7.6v on the yello=
w wire to ground is fine, but the black wire should be zero. <br clear=3D"n=
one">&gt; <br clear=3D"none">&gt; When you ground the yellow wire to the bo=
dy, the gauge should go to max. Sounds like you have a bad fuel gauge. Just=
 to be sure you can try grounding the terminal on the gauge that the yellow=
 wire goes to. <br clear=3D"none">&gt; <br clear=3D"none">&gt; Peace,<br cl=
ear=3D"none">&gt; Pat<br clear=3D"none">&gt; <br clear=3D"none">&gt; Pat Ho=
rne <br clear=3D"none">&gt; We support Habitat for Humanity<br clear=3D"non=
e">&gt; <br clear=3D"none">&gt; <br clear=3D"none">&gt;&gt; On May 9, 2020,=
 at 3:09 PM, RWM &lt;<a shape=3D"rect" ymailto=3D"mailto:[email-masked]" hr=
ef=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br clear=3D"none=
">&gt;&gt; <br clear=3D"none">&gt; <br clear=3D"none">&gt; =EF=BB=BFPat,<br=
 clear=3D"none">&gt; <br clear=3D"none">&gt; With ignition switch in runnin=
g position<br clear=3D"none">&gt; <br clear=3D"none">&gt; Yellow wire to ch=
assis is 7.6 volts, same as to black wire<br clear=3D"none">&gt; <br clear=
=3D"none">&gt; Yellow wire to ground, no gauge deflection <br clear=3D"none=
">&gt; <br clear=3D"none">&gt; Thanks<br clear=3D"none">&gt; <br clear=3D"n=
one">&gt; - Bob<br clear=3D"none">&gt; <br clear=3D"none">&gt; <br clear=3D=
"none">&gt;&gt; On May 9, 2020, at 13:19, Pat Horne &lt;<a shape=3D"rect" y=
mailto=3D"mailto:[email-masked]" href=3D"mailto:[email-masked]=
m">[email-masked]</a>&gt; wrote:<br clear=3D"none">&gt;&gt; <br clea=
r=3D"none">&gt;&gt; =EF=BB=BFHook everything back up except the sender. Tur=
n on the key &amp; measure for voltage @ the sender wires to ground. One sh=
ould show voltage &amp; the other should be grounded. (Not home now to get =
colors) ground the one with voltage. If the gauge still sits on empty you h=
ave a bad gauge. If there is no voltage it could be a bad connection or a b=
ad gauge. Let me know what y=E2=80=99all find &amp; I=E2=80=99ll walk you t=
hrough more diagnostics. <br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt=
;&gt; Peace,<br clear=3D"none">&gt;&gt; Pat<br clear=3D"none">&gt;&gt; <br =
clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Pat Horne <br clear=3D"=
none">&gt;&gt; We support Habitat for Humanity<br clear=3D"none">&gt;&gt; <=
br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt;&gt;&gt;&gt; On May 9=
, 2020, at 11:02 AM, RWM via Datsun-roadsters &lt;<a shape=3D"rect" ymailto=
=3D"mailto:[email-masked]" href=3D"mailto:datsun-roadsters=
@autox.team.net">[email-masked]</a>&gt; wrote:<br clear=3D=
"none">&gt;&gt;&gt; <br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt;=
 =EF=BB=BFThis has been discussed before, but here are the indications:<br =
clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Fuel gauge does not bud=
ge off empty <br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Fuel s=
ender resistance shows 34 ohms as installed, with tank less than half full<=
br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Fuel sender resistan=
ce when removed varies fairly linearly from 47 ohms (bottom) to near zero o=
hms (near top), then open circuit when the arm forces the wiper off the rhe=
ostat windings<br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Fuel =
harness is delivering 7.6 volts, measured with the yellow and black connect=
ors removed<br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Shorting=
 the fuel harness to itself (yellow to black) does not change the fuel gaug=
e indication<br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Ammeter=
 works, temperature gauge works<br clear=3D"none">&gt;&gt; <br clear=3D"non=
e">&gt;&gt; Ideas? Dash harness connector?<br clear=3D"none">&gt;&gt; <br c=
lear=3D"none">&gt;&gt; Thanks.<br clear=3D"none">&gt;&gt; <br clear=3D"none=
">&gt;&gt; - Bob Mann, '68 2000 Solex<br clear=3D"none">&gt;&gt; <br clear=
=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; ____________________________=
____________<br clear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; <a shap=
e=3D"rect" ymailto=3D"mailto:[email-masked]" href=3D"mailt=
o:[email-masked]">[email-masked]</a><br c=
lear=3D"none">&gt;&gt; <br clear=3D"none">&gt;&gt; Donate: <a shape=3D"rect=
" href=3D"http://www.team.net/donate.html" target=3D"_blank">http://www.tea=
m.net/donate.html</a><br clear=3D"none">&gt;&gt; Archive: <a shape=3D"rect"=
 href=3D"http://www.team.net/pipermail/datsun-roadsters" target=3D"_blank">=
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=3D"http://autox.team.net/archive" target=3D"_blank">http://autox.team.net/=
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---

From: mikelyons--- via Datsun-roadsters <[email-masked]>
Date: Mon, 11 May 2020 20:37:01 +0000 (UTC)

Mike Lyons
Vancouver, WA
-----Original Message-----
From: RWM via Datsun-roadsters <[email-masked]>
To: Pat Horne <[email-masked]>
Cc: Datsun List <[email-masked]>
Sent: Sat, May 9, 2020 1:57 pm
Subject: Re: [Roadsters] Fuel indication issues

Pat,

Thanks.

- Bob

alf full
 connectors removed
e fuel gauge indication
m.net/archive
[email-masked]

<br>

<div> <br>
</div>

<div> <br>
</div>

</div>
</div>
</div>