Fiat 126- Hand brake light, fuel leak, engine temp sensor probs...

Fiat 126 BIS - J Reg.
My handbrake light decided to remain on this morning? I had a look and the switch correctly has one wire going to it - but why has it only got one? I
used some switch cleaner but no success. Could it be brake fluid level sensor cap? I have known these to fail on other Fiats. My fluid level is fine.
My engine temp gauge has never worked.
The fuel tanks seams to be leaking slightly - commen problem? Easily fixed?
Advise needed please.
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wrote:

Only one wire because it completes the ground return to chassis. Are you sure that the handbrake lever in the down, released, position is hitting the switch? Side to side play due to wear can affect this. I think it is only a push on blade to the switch, does the light go out if you remove it from the switch?

Sensor connected, cleaned up the fuses lately.

Hose from filler to tank can perish. Find where it is leaking from, there should be some staining. Araldite or propriety fuel tank repair mix might do for a temporary repair until you can source a replacement, assuming it's an actual hole, which it probably isn't.

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Also I have just been told this: "I think the fiat 126 has a level sensor for brake fluid which will make this light stay on so don't ignore the light Check Your Brakes!!" to which I replied:"I checked my fluid level which is on MAX. I have had this sensor fail on other fiats, do you think this is the problem?"

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wrote:
If handbrake light stays on, even when disconnected from switch then it's a tracing the wire job. Bulb is fed from ignition switched supply, comes on when wire to switch is grounded, maybe the wire is trapped and being grounded.
Brake fluid level sensor goes closed circuit, turning the light on, when the fluid level falls, causing the float to fall. Again a push on connector, the light should go out if you pull off one of the push on blades.
Engine has several sensors, oil pressure, temp, reverse gear. Because the engine rocks a lot on its mounts, the wires to the sensors often fail, and of course the wires have to go to the right sensors. I had the air cooled version, not sure where all the sensors are on a J reg.
If the fuse box gives trouble things stop working and lights don't come on when they should. Not stay on when they shouldn't.
To see the pipe from filler to tank you really need an inspection pit, or to have it up on a ramp. The car is so low slung that you can't reall see anything in this area without being underneath. Fuel tank can get damaged if car is backed over something sharp, if it doesn't rupture the tank it removes the finish and rust rapidly finishes the job off.

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