Fuel Gauge needle "bouncing"

Fuel Gauge needle "bouncing"

Postby Surfin Safari [OP] » July 13th 2016, 6:48pm

I noticed yesterday that my Fuel gauge bounces around. The PO told me not to trust it so I use the DIC to monitor my fuel usage. when I get to around 18 gal used I head to a fill up Is this a bad float / sending unit?
Gauge.gif
Fuel Gauge "Bouncing"
Click on the image to see it move (I converted it to a GIF)
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Re: Fuel Gauge needle "bouncing"

Postby chevymaher » July 13th 2016, 8:03pm

That isn't to bad. Wow drive a chevelle. 3/4 tank and nail it and it goes down to empty. Let off it goes back up. You read it driving at a steady speed.

I wouldn't worry about it. Take a 2 gallon can of gas and run it to empty. I bet it is working fine. Just jiggly. There is a buffer in the system that slows the reading form bouncing like that. I bet that is what is wrong. And no I don't know where it is. Chevelle don't have a buffer at all and that is why they are are over the place.
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Re: Fuel Gauge needle "bouncing"

Postby redfury » July 14th 2016, 5:03am

The system takes a 240 ohm system and coverts it to a 0-100 ohm signal to the dash. It's a known problem. I replaced my fuel pump with a Delphi and had the same problem of a buzzing gauge to the point where you could hear it some times. I never really engaged in doing much in the way of testing, but I'm guessing there might be a body ground that isn't too happy. My gauge only really ever read accurately when it was down to a quarter tank. I always just filled up between 200-250 miles and kept track of every fill up. If you put the computer into a relearn position though, fill up at 150 miles for at least 2 tanks so you don't risk running out of gas ( ask me how I know? )
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Re: Fuel Gauge needle "bouncing"

Postby WoodButcher » July 14th 2016, 12:03pm

The PRND lights must look pretty at night,,, :rofl:

In my '97 the gauge bounces with my turn signal and has been like that since I got it in '00.
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Re: Fuel Gauge needle "bouncing"

Postby Surfin Safari [OP] » July 14th 2016, 4:18pm

redfury wrote:The system takes a 240 ohm system and coverts it to a 0-100 ohm signal to the dash. It's a known problem. I replaced my fuel pump with a Delphi and had the same problem of a buzzing gauge to the point where you could hear it some times. I never really engaged in doing much in the way of testing, but I'm guessing there might be a body ground that isn't too happy. My gauge only really ever read accurately when it was down to a quarter tank. I always just filled up between 200-250 miles and kept track of every fill up. If you put the computer into a relearn position though, fill up at 150 miles for at least 2 tanks so you don't risk running out of gas ( ask me how I know? )

OK. How do you know?
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Re: Fuel Gauge needle "bouncing"

Postby Leeann_93 » July 14th 2016, 10:39pm

I'm told (but I've never investigated) that the wiring bundle that runs under the battery is the cause of this - battery acid drips down and eats the insulation and you'll have a googy wire (technical term). Or the connection on the firewall is loose and has a burned spot.
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Re: Fuel Gauge needle "bouncing"

Postby WimpTech » July 14th 2016, 10:43pm

my '99 (Creeper Van) had a fuel gauge that was seriously nervous... or smoked out on crack because it would shake violently. I jiggled wires, didn't help, so I just took the middle of the shake as where it really is and never got under 1/4 tank. Problem solved... OK, not, how about... managed. ALthough I do feel kinda dumb that I didn't think of using the ole navi-computer... D OH!
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Re: Fuel Gauge needle "bouncing"

Postby Paradise97401 » July 16th 2016, 7:46am

in my 2002 Safari, had the same issue...it was the fuel pu,p that went out after the gauge started bouncing..replaced the fuel pump...everything is good now
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