Cheers, first post.

Having problem with fuel level on the gauge not displaying.
Gage is tested functional, so are dash connections, feeder wires, transfer wires etc.
There is current in the wire, after starter key is applied.

Pump looks like this, pink part being fuel level meter, with float and variable resistor plate.

Second pic is removed resistor plate, which I think is faulty, as it does give rising resistor values up to one point, and then it seems to cut connection.

When manually sliding connected float over plate, I never get any reading on the gauge.

Well, this pumps are extra expensive, not deliverable by fiat, only on backorder with aftermarket stuff, with mismatching part numbers, while some do sell float part only, but there is also a mismatch between models, like panda's, uno's, punto's, Y10's...

Third pic is FIATs answer to my inquiry.

Anyone experiencing similar problems?

There you go.
15 euro plus postage

http://allegro.pl/czujnik-poziomu-paliwa-fiat-panda-lancia-y10-orygi-i5689888633.html

Will wait for the product code 7600544 confirmation to be correct, as exact model, panda 4x4, 1.1, 40kW is not listed, but it is very price conscious compared to ebay.

As suspected, this part doesn't fit at all, length and widthwise.

Luckily, resistance board and its carry plate are the same, well not completely sure on resistor values.
Opened the new donor unit and sourced plate and springs from it, to make old one functional again.

Reserve warning light now working, fuel meter gauge still not working.

Don't really know if car has to run to show fuel level or is ignition ON enough to show it.
Cant start the car as fuel tank is still removed.

hmm sounds odd.. the ignition is all you need to display fuel level. i'd say check earths but it will be the more modern earthing system.
with the sensor out of the tank, dead short one of the terminals it will either make the fuel light come on, or make the fuel gage go to full. just a good quick way of testing if the gauge its self is ok. how do the wires connect to it? does it just use 3 wires?

if so it would be one live, one for the level indicator and one for the fuel light. make sure they are in the right place. if you have the live connected directly to the fuel light part and not to the right part, only the fuel light would work.

have a play.. so long as you dont mix the fuel pump connectors with the fuel levelling connectors you cant break anything.

Fuel pump uses 2 wire connector, fuel level uses 3 wire.

Shorting two (on a 3 wire conn.), does light up the low fuel light.
Connecting other two, doesn't boost the gauge to full.

Tested ground with multimeter buzzer - OK.

Tested all 3 wires from bottom connector, to where they come out in one of those three dashboard connectors, all are fine.

Tested gauge with direct 6V application, and it jumps to full level. (picture 1)

tested gauge with connecting 12V to where it gets current on dash connecting pins, and it also jumps to full.

I'll just have to redo all the tests, but I need a helping hand, so will have to wait some more.

on the 3 pin plug, short all 3 together and see if that does anything.

Just reserve light goes on.

sounds like an issue between the fuel level sender and the dash... have a look at the multi plug next to the fuse box.. theres 2 if i remember. just try unplugging them then plugging them back in and see if that fixes anything. give them a good spraying with contact cleaner or wd-40.

Connector is fine.
Some progress made elsewhere, but came to a halt.

Took gauge apart, and one of coil's four copper hair thin wires was snapped.
Since gauge has 3 options, as to where to solder it, it was a trial.

It paid off partially, because each of 3 options behaved the same, as in video.
Somehow, earth and "+" seem to be switched, because pointer moves to the left.

If i switch + and - on a bench, (via 6V battery), gauge meter goes to right direction.



When performing in car tests, fuel sender connector is shorted for full fuel level reading.

good work there! the temp gauge looks identical to the one used in the Fiat cinquecento.
maybe you could get a replacement rather than struggling with soldering the thin wire spring thingy.

Yup, and if replacement unit behaves the same, would indicate some strange wire/short problem.

Gauge seems to have one ground and two + connections.

black ground wire is tested to be grounded directly, no keyswitch
orange/white + gets voltage through keyswitch.
pink/black + gets nothing from nowhere, no matter what (key on, fuel sender shorted...)
300ohm resistor fitted between "+" on the gauge.
100 and 400 ohm resistance respectively, between +es and ground.
I smell a minor short here, saying as non electrician.

Three wire connector for sender unit is as follows:
green/yellow "+" via keyswitch
black- direct ground (fuel warning light)
black/yellow- ground through keyswitch (gauge)

If 100% sure, gauge was to blame, wouldnt hesitate on the purchase, but on the other hand, it's not as cheap to have it laying around.

http://www.ebay.com/itm/9943246-INDICATORE-LIVELLO-CARBURANTE-FIAT-PANDA-4x4-NUOVO-ORIGINALE-/252282201718?hash=item3abd30e676:g:0cwAAOSwPc9Wukkt&vxp=mtr

It seems different, than cinquecento's, especially the pointer.
http://www.ebay.com/itm/FIAT-CINQUE...hash=item2a1aead736:m:mGXO-pEFVdYmKcoIEifyv6Q

Well fixed.

Tried engine temp gauge on the fuel gauge spot. While at it, also checked how those coil wires were soldered in it, and resoldered correctly the fuel gauge wire.

Engine temp gauge uses 90ohm resistor instead of 300 like fuel g., so I presumed if it would work, it would be more abrupt meter movement, as it passes more current.

When connected, it also moved to wrong direction, when mimicking full tank.
This showed my fuel gauge could be OK, but sth. else was wrong.

So I tried shorting different pairs on the 3 wire connector, and it showed that actually the pair that lights the warning light also shows fuel level.

For the final test, I connected fuel sender, and pressed the float, to check resistor plate, and it worked in any position, showing different levels and also lighting the low level bulb when on the bottom.