Re: [Chrysler300] 1962 - Fuel Gauge Dilemma

["John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

sounds like tank is not grounded . do other gauges work ? if so and not messed with whole gauge cluster ok. do not go grounding wires at cluster you can blow up the gauge voltage regulator . 

try your test at gas tank again briefly short wire coming to sender to ground but get good clean ground st frame . ,

If gauge goes up has to be bad ground bad sender or corrosion on connectors . 

likely tank not grounded anymore .happens a lot . 

one way is clean pipe coming out if tank if sender out you can wrap good size wire like 14 building wire around the pipe and solder it , other end to frame . probably do similar thing in the car clamp wire to pipe with small fuel line hose clamp .

good luck,

john 

ps i have found vans sender tomboy read right near empty but it works! 

Sent from my iPhone not by choice 

On 25 Oct 2020, at 12:33 am, 'Ron Waters' ronbo97@xxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Pull sending unit. Measure reading at the bottom of the range (ohms). Now, measure reading at the top of the range. Compare these readings to the range in the factory shop manual. Are they the same ?

 

Check schematic. Is there a 12V to 5V Constant Voltage regulator attached to the fuel gauge ? These things go bad, resulting in the gauge reading at either one end or the other. This is most likely the cause of your problem.

 

Ron

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From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Matt Allyn allynentertainment@xxxxxxxxx [Chrysler300]
Sent: Saturday, October 24, 2020 11:23 PM
To: Chrysler 300 List
Subject: [Chrysler300] 1962 - Fuel Gauge Dilemma

Seeking any thoughts on why my fuel gauge won't work.

The Facts:

- 1962 300 Sport

- Astradome fully restored probably 25 years ago

- Car has sat for last 8-10 years

- Pulled tank to clean it out & discovered the sending unit pipe IN was separated from its sending unit housing, so...

- New Vans Auto Sending Unit installed a month or so go

- There is approximately 6 gallons in the tank

The Diagnostics:

- Test Light illuminates at Sending Unit; so there is power to the wire

- Test Light illuminates at power wire feed to gauge as well

- Sending Unit has Ohm reading at Sending Unit

- Fuel Gauge has Ohm reading as well

- Running an external jumper wire from the body of the Sending Unit to ground; had no effect on the gauge

- Grounding the Power Wire to the Sending Unit did NOT make the fuel gauge jump to FULL

Any other thoughts?

I cannot get a reading at the gauge that worked perfectly 8-10 years ago

Thanks!

Matt Allyn

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Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>

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