[Healeys] Fuel Probe
coudesluijs at chello.nl
Wed Nov 29 01:29:34 MST 2017
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.
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.
Op 28-11-2017 om 22:27 schreef Roger Grace:
> For interested listers ...
> 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.
> 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.
> 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 !
> See a few pix; if anyone wants more details - contact me directly.
> gauges are: original/new sm/aftermarket sm cheepo for testing
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