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This is very helpful, thanks.<br>
<br>
Once point I note is it seems the range of the 311 sender unit
resistance is backwards to the 310 -- greatest when tank is empty
(47 ohms) and least when full (approaching zero).<br>
<br>
- Bob<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/11/2020 4:42 PM, Pat Horne via
Datsun-roadsters wrote:<br>
</div>
<blockquote type="cite"
cite="mid:85555813-817A-4BCC-BFB4-7A0F04EB36E5@icloud.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Thanks, Mike. I’m not sure how this circuit compares to the 311
but I’ll check. One difference I see is that the 311s have a
voltage regulator for the instruments. I’ll have to check on the
ground for the gauge. If there is one, that could cause this
problem if it is bad.
<div><br>
</div>
<div>Peace,</div>
<div>Pat<br>
<br>
<div dir="ltr">Pat Horne
<div>We support Habitat for Humanity</div>
<div><br>
</div>
</div>
<div dir="ltr"><br>
On May 11, 2020, at 3:37 PM, <a class="moz-txt-link-abbreviated" href="mailto:mikelyons@aol.com">mikelyons@aol.com</a> wrote:<br>
<br>
</div>
<div dir="ltr">
<div style="color:black;font: 10pt arial;">I <font size="2">have
the Nissan Service Manual for the SPL 310. The attached
PDF is a copy of the information 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>
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</div>
<div> <br>
</div>
<div> <br>
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<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: RWM via Datsun-roadsters
<a class="moz-txt-link-rfc2396E" href="mailto:datsun-roadsters@autox.team.net"><datsun-roadsters@autox.team.net></a><br>
To: Pat Horne <a class="moz-txt-link-rfc2396E" href="mailto:patintexas@icloud.com"><patintexas@icloud.com></a><br>
Cc: Datsun List <a class="moz-txt-link-rfc2396E" href="mailto:datsun-roadsters@autox.team.net"><datsun-roadsters@autox.team.net></a><br>
Sent: Sat, May 9, 2020 1:57 pm<br>
Subject: Re: [Roadsters] Fuel indication issues<br>
<br>
<div dir="ltr">Pat,<br clear="none">
<br clear="none">
The black wire is zero (ground).<br clear="none">
<br clear="none">
Guess I'll try to work my fingers up behind the gauge
and check for continuity.<br clear="none">
<br clear="none">
Thanks.<br clear="none">
<br clear="none">
- Bob<br clear="none">
<br clear="none">
<br clear="none">
<div class="yqt5933953826" id="yqtfd68763"><br
clear="none">
> On May 9, 2020, at 16:53, Pat Horne <<a
shape="rect" ymailto="mailto:patintexas@icloud.com"
href="mailto:patintexas@icloud.com"
moz-do-not-send="true">patintexas@icloud.com</a>>
wrote:<br clear="none">
> <br clear="none">
> Bob,<br clear="none">
> That sounds a bit off. The 7.6v on the yellow
wire to ground is fine, but the black wire should be
zero. <br clear="none">
> <br clear="none">
> 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. <br
clear="none">
> <br clear="none">
> Peace,<br clear="none">
> Pat<br clear="none">
> <br clear="none">
> Pat Horne <br clear="none">
> We support Habitat for Humanity<br clear="none">
> <br clear="none">
> <br clear="none">
>> On May 9, 2020, at 3:09 PM, RWM <<a
shape="rect" ymailto="mailto:RWM@rwmann.com"
href="mailto:RWM@rwmann.com" moz-do-not-send="true">RWM@rwmann.com</a>>
wrote:<br clear="none">
>> <br clear="none">
> <br clear="none">
> Pat,<br clear="none">
> <br clear="none">
> With ignition switch in running position<br
clear="none">
> <br clear="none">
> Yellow wire to chassis is 7.6 volts, same as to
black wire<br clear="none">
> <br clear="none">
> Yellow wire to ground, no gauge deflection <br
clear="none">
> <br clear="none">
> Thanks<br clear="none">
> <br clear="none">
> - Bob<br clear="none">
> <br clear="none">
> <br clear="none">
>> On May 9, 2020, at 13:19, Pat Horne <<a
shape="rect" ymailto="mailto:patintexas@icloud.com"
href="mailto:patintexas@icloud.com"
moz-do-not-send="true">patintexas@icloud.com</a>>
wrote:<br clear="none">
>> <br clear="none">
>> 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. <br clear="none">
>> <br clear="none">
>> Peace,<br clear="none">
>> Pat<br clear="none">
>> <br clear="none">
>> <br clear="none">
>> Pat Horne <br clear="none">
>> We support Habitat for Humanity<br
clear="none">
>> <br clear="none">
>> <br clear="none">
>>>>> On May 9, 2020, at 11:02 AM, RWM
via Datsun-roadsters <<a shape="rect"
ymailto="mailto:datsun-roadsters@autox.team.net"
href="mailto:datsun-roadsters@autox.team.net"
moz-do-not-send="true">datsun-roadsters@autox.team.net</a>>
wrote:<br clear="none">
>>> <br clear="none">
>> <br clear="none">
>> This has been discussed before, but here are
the indications:<br clear="none">
>> <br clear="none">
>> Fuel gauge does not budge off empty <br
clear="none">
>> <br clear="none">
>> Fuel sender resistance shows 34 ohms as
installed, with tank less than half full<br
clear="none">
>> <br clear="none">
>> 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<br clear="none">
>> <br clear="none">
>> Fuel harness is delivering 7.6 volts,
measured with the yellow and black connectors removed<br
clear="none">
>> <br clear="none">
>> Shorting the fuel harness to itself (yellow
to black) does not change the fuel gauge indication<br
clear="none">
>> <br clear="none">
>> Ammeter works, temperature gauge works<br
clear="none">
>> <br clear="none">
>> Ideas? Dash harness connector?<br
clear="none">
>> <br clear="none">
>> Thanks.<br clear="none">
>> <br clear="none">
>> - Bob Mann, '68 2000 Solex<br clear="none">
>> <br clear="none">
>> <br clear="none">
>> ________________________________________<br
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<div><SPL310 Fuel Gage.pdf></div>
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