Question by  mathubex (16)

What could be causing my fuel gauge to be spastic?

When I crank my car it says I have a full tank of gas, then it goes down to half a tank, and later back up.


Answer by  Adrian29 (547)

The censors within the tank are bad, or the fuel pump censor has gone bad. These are relatively easy easy to change. Rarely the dash assembly itself will be bad.


Answer by  pigrider (7)

The guauge on my Harley drove me crazy for along time, all that was wrong was the float was getting stuck. Just had to pull sending unit out of tank and tweak it just a tad so it had free movement and wasn't dragging on anything


Answer by  Amber40 (24961)

Well there good possible be an issue with either the gauge itself or the sending unit. The first thing to check is the ground, then try replacing the sending unit.


Answer by  fs (41)

You could have a faulty ground wire from the sending unit. Also, a faulty module (on newer vehicles) will cause this.


Answer by  kennethjgoodson (4903)

It could be the actual regulator in the gas tank going bad on your vehicle. It will cause the needle on the dash to do crazy things.

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