[JohnJ69]

My Motorhome shows a full tank of fuel all the time. I’ve had the sender unit changed twice and still hasn’t cured the problem. I tried changing the circuit board under the dashboard as per a post on here and still not working correctly. The clocks are new so I’m at a loss now so any help would be appreciated thanks

 

[Scotjimland]

Sorry, don't have the answer, but have you tried a post on the Fiat Forum.. ?

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[jiwawa]

If you do find an answer John, maybe you'd post it back here to help someone else in the future. 🤞

 

[nickkdx]

On my 2001 Fiat based motorhome had a dodgy fuel gauge and I cleaned with wd40 a grey multi plug under dash near fuse box and that help.

 

[Malshadow]

Have a look for this voltage stabilizer it may or may not be included in your circuitry around circa 2000 located under lower dash also common earth wire bunch also below os or ns headlamp does everything else work including the warning horn as i think that shares the same ground[earth ] try and give that a toot while you observe the gauge

 

[Scotjimland]

The fuel sensor is a simple device, just a flat that uses a variable resister ,

as the float moves up or down , a wiper moves across a wire resister , this increases or decrease the voltage in the circuit, the highest resistance is experienced when the tank is empty...as you fill the tank the wiper moves and reduces the resistance until it is zero.. and the voltage is maximum. ie 12v .. gauge shows Full

Your tank shows full which would suggest there is a short in the wiring, it could be a short in a connector block or anywhere the wire is exposed near the chassis or body .. disconnect the sender and see if the tank shows empty.. if not then it's a short in the wiring.

hope that helps

 

[weldted]

Without stating the obvious have you tried disconnecting the sensor wire turn the ignition on see if the gauge moves?