Any thoughts/opinions would be welcome re this problem, guys.

Fuel gauge didn't work; problem traced to tank sender unit, so new sender
unit purchased - actually for 1966 A-H Sprite, because we knew it would
physically fit (ring of 6 bolts). New one did work but, unfortunately, wrong
way round: when tank was full gauge read empty and visa-versa.

The fuel gauge will not be a Morgan original, having been sourced at an
autojumble. Important details are that: (1) with igniton off gauge reads
empty and (2) with ignition on but sender unit wire disconnected gauge reads
full.

So, presumably, we need a sender unit with the six hole round plate base
which gives maximum electrical resistance when the tank is full of fuel,
least resistance when empty. Please can anyone comment on this analysis and
/or give advice on what sender unit might be appropriate and/or from where
it might be purchased.

Thanks in advance,

Tony

On Sat, 05 May 2007 15:39:13 +0100, vat677 wrote:

So use the one you have, upside down and with the wire bent a bit if
necessary.

Ian

vat677 wrote:

vat677 <vat677 (AT) vat677 (DOT) karoo.co.uk> wrote

when you go over a bump with a half full tank, and the one that stays
steady. The one that flaps around is normally connected to directly to a
live ignition circuit and reacts directly to the sender unit, like an
ohmmeter would. The type that holds steady usually has a heater and
bi-metal strip inside, and works off a stabilised 10 volt supply. Depending
on which way the bi-metal strip is designed to bend when heated, increased
heat can result in either a higher or lower reading. So it is possible for
a gauge to be designed so that it reads full with the sender at minimum
resistance, though whether your is, I can't say. What you need to do is put
a meter on the sender unit you have bought and see which way round the
resistance changes as you move from empty to full. Your gauge is expecting
the opposite.

I am not familiar with your tank unit either, but is there any way of
reversing the ends of the variable resistance electrically?

Jim

vat677 wrote:

Just as a thought why not ask the Morgan Company if they can suggest a
unit - the company seems to take an interest in all there cars old or new.

http://www.morgan-motor.co.uk/