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<div class="moz-cite-prefix">The original sender/bi-metal gauge
combination of this kind should work fine and is reasonably
accurate. The earlier coil gauge is a different matter. It does
not really give a steady reading. You cannot mix the sender for
the coil gauge with the bi-metal gauge and v.v. <br>
The sender can have the rare fault with earthing or a broken coil
but it is easily replaced. Another often overlooked problem is the
10V voltage stabiliser that serves the fuel gauge and the
temperature gauge. This is a small metal box usually attached to
one of the instruments. The bi-metal keeps the average voltage at
10V. It is not very stable but fairly durable. If faulty it can
better be replaced by a solid state device. If both temperature
gauge and fuel gauge are erratic, replace the voltage stabiliser.<br>
Kees Oudesluijs<br>
<br>
<br>
Op 28-11-2017 om 22:27 schreef Roger Grace:<br>
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<div>For interested listers ...</div>
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<div>Ever since I acquired
my BJ8 I have been
frustrated with the fuel
sender unit and gauge
performance and
reliability. Changed out
the sender 2x and many
hours fiddling with
gauge adjustment that
really with the dual
attracted armature
mechanism is a
challenge. The MS sender
ground strap solution
helps if you have a
problem with crud in the
shaft bushes but doesn't
help for bad sender coil
winding or slider
contact malfunction. </div>
<div>So. I embarked on a
mini science type
project to do a full
replacement with a
capacitive electronic
fuel probe and a modern
stepper motor type of
gauge. The biggest
challenge was getting
the probe to fit into
the original sender unit
opening. Our tanks have
a 6 hole flange and
modern cars use a 5 hole
SAE bolt pattern and an
adaptor wasn't feasible.
In the end used a probe
with 1/8 npt and remote
electronics. With
careful arrangement of
the Al mounting flange
that had to be made, was
able to get the probe to
also measure the fuel in
the small well at the
bottom of the tank
before recording E. Next
time would do slightly
differently to account
for the dead zone at top
of the tank that caught
me out.</div>
<div>I had a Smiths look
alike gauge built but
with a modern 5V stepper
motor drive. After
numerous hiccups along
the way, have now got it
working satisfactorily
... after spending far
too much time (and $) on
it as well ! Will verify
final accuracy on the
road next Spring !</div>
<div>See a few pix; if
anyone wants more
details - contact me
directly.</div>
<div>gauges are:
original/new
sm/aftermarket sm cheepo
for testing </div>
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<div>rg</div>
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