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08-03-2016, 11:05 PM
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#1 |
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Registered User
Join Date: May 2016
Location: Georgetown, Texas
Posts: 32
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Fuel Gauge "Bouncing"
So I've searched this and found a few but, I just want to be clear on what I need to do before I have to pull the tanks.
The problem is once the truck is running the fuel goes anywhere from 1/4 of a tank to full and bounces all over the place. So is it the gauge? The Sending unit? I don't believe it's a ground near the gauges, I found the splice and everything looks great, maybe it's a ground elsewhere? I really need some help here as I really don't want to drop both tanks including the driver side is 3/4 full. |
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08-03-2016, 11:11 PM
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#2 |
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Registered User
Join Date: Oct 2014
Location: mi
Posts: 359
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Re: Fuel Gauge "Bouncing"
I had some issues with my gauge not working. intook the gauge out of the cluster and sanded the terminals on the gauge. Check the printed circuit also. I ended up buying a nicer cluster for my truck and the gauge started working.
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TJ 76 gmc 1500 swb patina finish Dropped 4/5, 350/4 speed 80 Chevy c10 lwb 305/350 |
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08-03-2016, 11:57 PM
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#3 |
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Registered User
Join Date: Apr 2007
Location: Birmingham AL
Posts: 266
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Re: Fuel Gauge "Bouncing"
Might not help with your specific problem but good reading on the subject.
http://67-72chevytrucks.com/vboard/s...d.php?t=640615 http://67-72chevytrucks.com/vboard/s...d.php?t=668356
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Stock 75 C10 step side. 350 2 BBL, 350 trans. 150K miles. |
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08-04-2016, 02:07 PM
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#4 |
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Registered User
Join Date: Apr 2007
Location: Birmingham AL
Posts: 266
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Re: Fuel Gauge "Bouncing"
Matthew21lutz I forgot to ask if your fuel gauge pointer bounces around with the truck running but sitting still in the driveway?
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Stock 75 C10 step side. 350 2 BBL, 350 trans. 150K miles. |
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08-04-2016, 06:36 PM
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#5 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
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Re: Fuel Gauge "Bouncing"
There are lots of theories on this. I attribute mine to cheap Spectra brand sending units. I would install AC Delco sending units if I had the same problem, which are about $100 more per sending unit.
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08-04-2016, 06:56 PM
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#6 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: Fuel Gauge "Bouncing"
Things to try...
One theory about the cheap sender units is the float arm is not making good electrical contact with the sender body. Why is that important? The rheostat wiper is attached to the float arm and uses that part as its' ground. Solder a braided copper strap from the float arm to a non moving metal portion of the sender. Some speedometer and gauge repair shops will inject a thick non hardening silicone damping gel into the core of the meter around the shaft.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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08-04-2016, 07:23 PM
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#7 | |
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Registered User
Join Date: May 2016
Location: Georgetown, Texas
Posts: 32
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Re: Fuel Gauge "Bouncing"
Quote:
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08-06-2016, 12:47 AM
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#8 |
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78 Big10 454
 
Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 839
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Re: Fuel Gauge "Bouncing"
I had the exact same problem. Got under my square and began to trace the wiring from front to rear. Right under the passenger door, the wiring was held by a factory clip that had chaffed the wiring, causing it to short out against the frame. A bit of electrical tape and problem solved.
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1978 Chevy SWB C-10 2WD 454/400 |
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