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I have 67 wagon and the gas gauge works some times and all at once it goes all the way to right and later on it will start working again , any idea why
 

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check the ground wire on the sending unit, may be a bad connection at the unit or where it bolts to the frame..

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70 chevelle ss396 conv
66 chevelle ss396 hdp/conv
 

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this topic has been well discussed here.

Do a site-wide search. Fred Aldrich has a great web-site that covers this and other tech things in a marvelous way.

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??michael j Team Chevelle Gold #77
70 Chevelle SS396 4sp, Fathom Blue/White Stripes - Canadian built
 

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Richard,

The above comments are correct. FYI, When the wire that runs from the tank to the guage is disconnected the guage will peg itself on the full side so a bad connection anywhere along the way will cause your problem. It sounds like your guage is OK, it's not getting the signal from the tank.

Good luck,

Bill
 

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I have a similar problem. I've got a '70 Elky non-SS and when I fill it up with gas, the gas guage doesn't go all the way to the top even though I know the tank's full. Is the guage sticking or is the sender in the tank? Thanks!
 
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