<VV> Gas gauge accuracy
J R Read_HML
hmlinc at sbcglobal.net
Tue Jul 28 02:55:21 EDT 2009
If I recall correctly, the resistance element (LM) in the tank has 2 (maybe
3?) coils to it. Should one of those coils fail, the reading will be too
high on the gauge with a full tank. BUT, it will work (the dash gauge)
close to normal below at about 1/3 of a tank. Correct?
It will provide the impression of good gas mileage for about 1/2 a tank -
and then... What the H happened...
Maybe EM is the same? Just at a different OHM range?
Also... I think that you meant to say ONE of two things.
Later, JR
----- Original Message -----
From: "Tony Underwood" <tony.underwood at cox.net>
>
> Incidentally, if the gauge reads above full it's likely being caused
> by two things:
>
>
> That same bent float rod, combined with a bent stop on the variable
> resistor wiper housing (look at one closely, you'll see what I'm
> talking about), which is allowing the wiper inside the sending unit
> to run completely off the resistance unit (which is
> wire-wound).
>
> ...or something like that. ;)
> tony..
>
>
> PS: a dented tank can cause similar issues especially if the
> flange surface where the sending unit mounts is also bent or warped
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