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Old 10-18-2012, 07:13 PM   #1 (permalink)
SubLo
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Fuel Gauge is Possessed

Hey all.

I have a 1996 K2500 6.5TD Suburban. Psyched about it. I've already learned a hell of a lot from this forum, GMT400, FSC and a host of vendors. I've already ordered tires/rims, PMD cooler and oil cooler/lines. Replaced faulty mechanical bits like power steering pump, etc. Installed a double-din kit and a bunch of other cosmetic stuff.

What's driving me nuts at this point is the fuel gauge. It reads accurately. However, any acelleration will cause the gauge to bounce around between E and around 5 o'clock wildly until I let off the pedal again. It even crashes into the needle of the gauge below it sometimes.

Any idea why?

Thanks.

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Old 10-18-2012, 07:37 PM   #2 (permalink)
racer55
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Bad ground is the most common cause of a gauge that will read past full.

Anytime an open circuit happens the gauge will swing widly up past full,this can happen from a sender resistor that is worn out and losing contact.

Repair the ground and/or a new sending unit is where I would start.

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Last edited by racer55; 10-18-2012 at 07:40 PM.
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Old 10-18-2012, 07:58 PM   #3 (permalink)
JSarge
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Mine had been doing crazy things too. After replacing the sending unit, it was still acting up. Wound up tearing into the gauge cluster, and the gauge itself was worn to the point if you lightly touched it, it would just fall. Used eBay cluster fixed it up.
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Old 10-18-2012, 08:31 PM   #4 (permalink)
JorgeNY
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Im expeirencing the same issues with my fuel gauge, also a 96 truck
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Old 10-18-2012, 09:20 PM   #5 (permalink)
Sergeant Dudz
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Same here lol, mine goes nuts, empty is actually a quarter of a tank, and full is past full. But eh if anyone steals ma truck they will think they have a 1/4 of a tank and BAM! then I drop in and ninja them outta the truck and re-take my property.... uh but yea, Fuel gauge on my '96 acts up too.....
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Old 10-18-2012, 09:46 PM   #6 (permalink)
abwdvm
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Mine did that. I worked the grounding point at the rear of the engine, next to the fuel filter. Solved the problem.
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Old 10-18-2012, 10:37 PM   #7 (permalink)
FloridaHorseman
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Fuel gauge just reading inaccurately is probably a sending unit problem. Gauge bouncing all over the place with truck motion is probably wires losing power or ground. The purple wire with a white stripe is the power wire. Black is ground.

As mentioned, it COULD wind up being the gauge itself. But I'd check the more likely wires at the tank first. ~FH
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Old 10-20-2012, 11:23 AM   #8 (permalink)
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Having some oddball problems with mine as well, it read within the lines, but kinda bounces around, almost like it follows the oil press gauge on accell and decel hahah. Full was FULL on the gauge, but nothing like being down around 5 o'clock. It seems to never go more than 1/8th of a tank in it's random bouncing.

Might tinker on it today when I'm doing other stuff, someone said the ground was black, and the power was purp/white was power. There's a ground at the back of the engine near the FFM? Where is it exactly? I'd like to throw a wire brush on as many contacts as i can find to maintain a good steady reading.
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Old 10-20-2012, 11:30 AM   #9 (permalink)
2010flhp
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Quote:
Originally Posted by SubLo View Post
I have a 1996 K2500 6.5TD Suburban. Psyched about it.
Nice truck, but then I'm partial
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Old 10-20-2012, 11:32 AM   #10 (permalink)
JorgeNY
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I think the ground is bolted on top of the motor towards the back under the tranny fill tube bracket.

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