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If this motion responds to acceleration, deceleration, turning, incline, decline; suspect the following (most likely listed first):

1-sloshing problem, possible bad tank (baffles broken)

2-worn fuel level sender

3-poor electrical connection

If it responds to engine RPM:

1-faulty alternator

2-bad gauge

3-bad gauge and dying battery or corroded (or loose) connection at battery

If it just jumps up and down whenever:

1-fuel level sender worn

2-poor electrical connection

3-bad gauge

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Q: What causes gas gauge to move up and down when not pressing on gas peddle?
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