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12-28-2016, 02:18 AM
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#1 |
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Registered User
 Join Date: Nov 2011
Location: San Luis Obispo, CA
Posts: 198
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Fuel Gauge
My fuel gauge on my '76 jumps around like a cat on a hot tin roof once the gas starts sloshing around. I don't think this is normal. What kind of dampening was designed into the system? Does the sender unit have some type of dampening feature or maybe the gauge itself? Any ideas would be appreciated!
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66 Custom Camper 327 AC PS PB 66 C20 292 76 C25 Sierra Classic 76 C25 Sierra Grande 76 Camper Special 77 Sierra Grande 02 Suburban - the DD |
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12-28-2016, 09:31 AM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,519
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Re: Fuel Gauge
When mine did that, I replaced the gauge and fixed the problem. Got one from the local pull a part for $5. I think the dampener is in the gauge.
If you replace the gauge, it will likely behave differently then the old one. My tank had about 4 gallons left when the first gauge hit empty. It has about 1 left when the new gauge reads E. Glad I have dual tanks. |
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12-28-2016, 10:28 AM
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#3 | |
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Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Fuel Gauge
Quote:
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12-28-2016, 12:04 PM
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#4 | |
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Registered User
Join Date: Aug 2011
Location: Tucson Arizona
Posts: 164
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Re: Fuel Gauge
Quote:
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12-28-2016, 06:58 PM
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#5 |
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Registered User
Join Date: Sep 2010
Location: Lake Tahoe, Nevada
Posts: 755
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Re: Fuel Gauge
Ditto to all of the above.
It's theoretically possible to build an electrical dampening into the circuit, in the form of a low-pass filter. The problem is that the values involved make it dangerous for a simple filter, leaving only the possibility of a complex filter. But complex filters are more complex (duh), and thus more expensive. I played with the design a little bit, up to a 6th-order filter, and the inductors just got more and more expensive until I abandoned the whole idea. We had a pretty good discussion about it several months ago here: http://67-72chevytrucks.com/vboard/s...ighlight=farad
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I know a little about cars, but if you have a question about electricity or sport quads, I'm your man!!! Last edited by wilkin250r; 12-28-2016 at 07:08 PM. |
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12-29-2016, 10:24 PM
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#6 |
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Registered User
Join Date: Nov 2011
Location: San Luis Obispo, CA
Posts: 198
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Re: Fuel Gauge
Thanks for the great feedback... silicone dampening fluid... makes perfect sense. Only question now is can a unit be repaired by getting inside and replacing the grease that has leaked out and then seal the cavity back up? Does anybody specialize in this kind of fixit job?
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66 Custom Camper 327 AC PS PB 66 C20 292 76 C25 Sierra Classic 76 C25 Sierra Grande 76 Camper Special 77 Sierra Grande 02 Suburban - the DD |
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12-30-2016, 12:20 AM
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#7 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,933
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Re: Fuel Gauge
There are speedometer repair outfits that can do this. I can't find the C2 C3 Corvette article on the subject. If I could I'd post it.
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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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