Gee Doug, I'd have thought both cars would use the same component too.
There are 3 (I think) different ones for the midget, depending on
year/model, so they may cross reference.
The one I measured for my earlier posting also reads an open circuit
once it goes to the end of its travel, and that point was accompanied
by a perceptable click. Perhaps the resistor wiper running past track?
On my car, the gauge reads 1/2 tank while the ignition is live,
irrespective of the amount of fuel on board. By flicking the wire from
the guage to ground, I can cause the needle to move to full, so I
presume the sending unit to be faulty.
At any rate, these gauges are imprecise on a good day so I wouldn't
worry too much about variations between units. Your old one was close
enough to my new one for my piece of mind! As for your new one, are
you sure it is the right one? Where there is a difference, perhaps
that could cause a faulty reading. Try connecting it and see what it
shows on the dash. Just remember to ground the unit.
Hal
______________________________ Reply Separator _________________________________
Subject: RE: Fuel guage sender ohms, second try
Author: Douglas Gaither <gaither@ix.netcom.com> at ccout
Date: 1/12/98 12:41 PM
This caught my attention as I had purchased a new sending unit for my MGB,
but had not yet installed it (waiting to have the tank prepped/replaced).
I would think that the Midget and the MGB would use the same off the shelf
components although my new one had a different Moss# - 360-660.
My new one measures 23 ohms at full tank; about 70 ohms at half (approx);
and just before it is completely empty it peaks (variably) at 197 ohms and
then the circuit opens during the last few degrees of movement.
Does this mean that my gas gauge will never quite read full and that it
will read bone dry when I still have a little gas left? I hate inaccurate
gas gauges! Is this a bad sending unit? What does the dash gauge need to
register Full/Half/Empty?
BTW - the sending unit that I summarily dismissed without checking read 15
at empty, 85 at half; 195 before it blacked out. Maybe I should've just
kept the unit I had!
Doug Gaither
-----Original Message-----
From: Hal Cummings [SMTP:halc@mazda.genauto.com]
Sent: Friday, January 09, 1998 6:34 AM
To: mgs@autox.team.net; spridgets@autox.team.net; ctp@gbn.org
Subject: Re: Fuel guage sender ohms, second try
Chris,
A new unit just received from Moss (P/N 361-890) reads:
14 ohms at full tank
90 ohms at appx half tank
258 ohms when you ought to be lookin' for gas
Measured from ground (base of unit) to the wire spade connector with a
Fluke 75.
Hope this helps!
Hal
______________________________ Reply Separator
_________________________________
Subject: Fuel guage sender ohms, second try
Author: Christopher T Palmer <ctp@gbn.org> at ccout
Date: 1/6/98 11:02 PM
Hi all,
I'm not sure if the original message made it to the list or not, or else I
lost the thread, or you're all just ignoring me ;)
I need to know the proper ohm readings for the fuel tank sender in an MG
Midget when full and empty...trying to isolate a fuel guage problem and
figured I'd tap an ohmeter into the sender line while filling the tank and
watch the resistance change, but...what's the range I should look for?
TIA,
CTP
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