Ferrari Mailing List: Fw: fuel gauge on 308

[pbennett (pbennett]

A faulty gauge is quite rare.  Pulling the fuel gauge requires removing steering wheel, unplugging all dash gauges from beneath the dash, and removing the entire gauge assembly.  Doable but not the place to start. 

 

The 308 fuel 'SENDER' commonly goes bad and is easy to replace.  It is located atop the left fuel tank.

Typical 'bad fuel sensor' symptoms are : that the gauge works fine when gas tank is full but as gas is used the gauge suddenly drops to empty, due to a broken rheostat wire within the sensor...part way down the sensor.  Note that the float arm moves up/down the sensor rheostat.

There is always the possibility of a bad ground at the sender (top of left fuel tank)
A bad ground will produce low readings at ALL tank levels.

p

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The 308 fuel 'SENDER' commonly goes bad, requiring an easy replace.
A faulty gauge is quite rare.
HOWEVER

There is always the greater possibility of a bad ground at the sender (top off left tank) See attached diagram. The usual 'bad sensor' symptoms are that the gauge works fine above a full tank then suddenly goes to empty, due to a broken rheostat wire part way

down the sensor.  (The float arm moves up/down the rheostat).
A bad ground will produce low readings at ALL tank levels.

p

Attachment: FuelGauge.jpg
Description: JPEG image

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