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Old 05-15-1999, 01:12 AM
Nick Jamal
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Beginning last week, my gas gauge needle bounces erratically after the car hits bumps of any significance on the highway. It remains otherwise accurate. This problem is semi-amusing but eventually gets very irritating...

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Old 05-15-1999, 01:42 AM
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Try to use your hand to hit the left side of
the instrument (ignition key on or runing)
see the fuel gauge needle bounce or not ?
If the gauge dos't bounce it must be the fuel
tank sending unit(in side the gas tank)
On your 86 300e should be in side your trunk
behind the installation. It do require a 46mm
socket to open it.
Old 05-23-1999, 06:39 PM
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While it may be the sending unit in the tank, don't rule out the possibility of a wiring problem, such as a bare spot somewhere in the harness. I would expect cornering to have more of an effect than simple bumps, if it was the sending unit, as it tends to make the liquid in the tank slosh around, moving the float arm, whereas the same liquid tends to damp the fast motion causing the intermittent condition. I'd be looking at wiring and connections first. If all else fails, then I'd look at the sending unit itself. Good luck with it.
Old 05-23-1999, 07:01 PM
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Don't know what model car you have but sounds like a broken wire at the fuel tank plug connection.
Old 05-23-1999, 09:00 PM
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When I first got my '86 300E last spring, I had the same exact thing happen to lasted a month or went away and has never came back! Go figure....


1986 300E 138k
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