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Fuel guage fluxating

Tiny
LSUSSEL
  • MECHANIC
  • PONTIAC BONNEVILLE
Ok, I cant figure this one out, maybe some of you have more experince with this then me

2000 bonneville pontiac 66, k

the fuel gauge is flucuatiing exteremly, it goes from half a tank all the way down to completely empty and back up again. It only starts fluxating near half a tank and when I acclerate or turn a corner it goes up and down, as if when I start the car its all the way empty fuel light is on, I start to drive and it goes back up. This is too much of a fluxation to be normal, I started using higher grade gas and we just cant figure it out, any help would be much appericated!
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Thursday, April 5th, 2007 AT 9:49 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sometimes you get a sending unit that is particularly sensitive and will fluctuate as the fuel sloshes around in the tank.

Does it have an anti slosh module? How about a fuel level sensor. I would start with checking the ground circuit on the unit.
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Friday, April 6th, 2007 AT 12:57 AM
Tiny
LSUSSEL
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Yes it has both, this just recently started. What do you mean ground wire? Could it be a unit going bad? Or something in the dash?
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Friday, April 6th, 2007 AT 11:35 AM
Tiny
RASMATAZ
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I would check the fuel level sensor first-this one can be a bear from the tank to the dash
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Friday, April 6th, 2007 AT 4:32 PM
Tiny
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Yea so I heard. How do you go about checking this? I was told if its a bad sensor you must pull the whole tank, and replace, because the fuel pump tank and sensor are all in one. So I know its pretty bad from the wire to the guage, but how should I go about checking it?
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Friday, April 6th, 2007 AT 8:58 PM
Tiny
RASMATAZ
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When I was @ about. Com I've seen this before-supposely the level sensor gets corroded. You just have to get in there and pull Miami CSI on it. For me I've never been confronted by this ghost and don't wish for it.

Let me find out more from my friends @ iANT, and get back with you.
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Saturday, April 7th, 2007 AT 1:29 AM
Tiny
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Check the fuel level sensor contacts/clean it-don't work-fix by replacement. Also check the black ring that's the one that goes up and down that increases and decreases resistances being send back to the gauge

BTW is it throwing a code/s

So much of electrolysis huh!
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Saturday, April 7th, 2007 AT 3:22 AM
Tiny
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  • 252 POSTS
Thank you!

Il try that, no codes, no service light. Soo, the sensor is the nod sticking out of the side of the tank undernath the car? Wouldnt you have to drian the tank to pull and clean sensor or you would get gas everywhere?
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Saturday, April 7th, 2007 AT 8:47 AM
Tiny
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You have to drain/drop/pull it/inspect/clean test
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Saturday, April 7th, 2007 AT 4:41 PM

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