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Old 10-23-2012, 04:34 PM   #6
motornut
78K & 79C Jimmys
 
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Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: Fuel gauge question? 1985 Chevy C30

i just replaced the tank and sender in my 79
both Spectra brand (no bouncing issues before or after)
i had a bouncer in the 78 tho
Spectra brand again but
changed the cluster from idiot to tach/gauge
added some grounds behind it and the bounce went away

when i first looked into the bounce ,adding a ground was suggested here
not sure why it didn't help me when i test grounded it
and why it stopped when i added the diff cluster
i can only suggest there must be feed back disrupting the path to ground
seeing they all go to one wire
and it can't hurt to add one...
when I ordered this one my parts guy said he never heard of this issue and he sells a lot of the Spectra brand
and tank is not baffled
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John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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