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fuel gauge problems

To: mgs@autox.team.net
Subject: fuel gauge problems
From: wzehring@cmb.biosci.wayne.edu (Will Zehring)
Date: Thu, 27 Apr 1995 08:06:36 +0500
Fellow fiends:

Okay, so I'm joining the legions of those with some sort of electrical 
problem with the fuel gauge/sending unit circuit.  I changed the sending 
unit last night and it hasn't improved my problem: the gauge is having 
seizures on an almost minute by minute basis.  I put in a new sending unit 
so, apart from the possibility of a poor ground at the tank, I'm operating 
on the assumption that the sending unit is good and the gauge is bad.  I 
want to check the voltage at the gauge.  Hence: rediculously stupid electics 
question:  I assume that what the sending unit really is is a variable 
resistor (Yes/no?).  Hence, what the gas gauge really is is an ampmeter 
(yes/no?).  Can I just hook up my trusty radio shack amp/volt meter to the 
lines and make sure that the signal is a steady one (i.e. that the needle's 
dance is not due to wildly fluctuating signals from the sending unit)?  What 
do I read?  Amps?  What scale?  Comments?  Diplomas?

I suppose it is time to either (1) ignore the whole thing and fill up every 
200 miles or (2) get the gauge fixed.

Will "and my oil preassure gague is sticking, too" Zehring


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