Gas guage problem

[John Hertog <crossram@xxxx>]

Hi Dave, and all

I have the same problem with my "G". New everything, wiring harness, etc.
; still, the gauge won't read full. So, replaced the sending unit. Same
situation.

Seems to me that the problem is located in the voltage regulator built in to
the oil pressure gauge. The gas gauge needs 5 volts to operate. If it is
getting more, or less, voltage, it could affect the readings.

Look at the schematic for the car. 12volts goes in to the oil pressure
gauge. It then gets dropped to 5 volts, which feeds both the fuel gauge and
the temp gauge.

You should measure the output voltage of the oil pressure gauge and see
whether it is within specs. (Hint: use an analog voltmeter, as a digital
unit gets confusing to read due to the voltage spikes and drops every time
the points open and close. The analog meter will "average out" the readings
nicely.) If voltage not within spec, the oil gauge should be rebuilt or
replaced, OR you can bypass the oil gauge's voltage regulator and install a
NAPA #IR-5 ( I think that's the number) voltage regulator, which does the
exact same thing. This is the same voltage regulator as can be found in a
1964 Chrysler. It reduces battery voltage to 5 volts. It can be installed
without chopping wires, and will fit in there nicely.

I did this modification to one of my cars and the fuel gauge now works the
way it should. I have not had time to do it to the gold "G", but I am
fairly confident that it will fix the problem.

Hope this helps,

John

----- Original Message -----
From: "David Schwandt" <finsrus@xxxx>
To: "list server" <chrysler300@xxxxxxxxxxxxxxx>
Sent: Monday, June 16, 2003 7:32 AM
Subject: [Chrysler300] Gas guage problem


> Hi Gang, Put in my new gas tank sending unit last week in preparation for
the trip to Battle Creek meet. Darn thing reads the same (3/8-1/2 tank) same
as the old one. It is one of the "new" units offered by Atwater-Kent on
E-Bay.
>
> Everything us hooked up and grounded well at the tank with a Year One
ground strap (JUNK-TOO BENDY AND WONT SPRING BACK TO MAKE TIGHT CONTACT WITH
GAS LINE) and Year One gasket (TOO THIN) and a Year One Locking ring (LUGS
NOT TALL ENOUGH HAD TO USE 2 GASKETS) and Year One filter sock (THIS PART IS
OK)
>
> The gauge works clear to full when grounded out but won't go over 3/8 to
1/2 half when hooked up. What gives! Any brain storms out there?? The new
unit had the right bends and a new cork float as opposed to the brass float
on the original unit and a more "modern" looking control "pot". Thought I'd
ask around the list before I embarrass myself and right these people a
letter.
>
> No one at the met seemed to have any ideas and several mentioned they had
the same problem with their original units.
>
> Dave Schwandt
>
>
> [Non-text portions of this message have been removed]
>
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