RE: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge replacement

Thanks John! The moral of the story is if you pay for a rebuilt Fuel gauge, the entire system sometimes fails you. It’s not like bringing your watch in to be fixed. Watches either show the right time of not. Fuel gauges and the system have a lot of moving parts. We live and learn.

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of John Grady
Sent: Friday, June 28, 2024 9:29 AM
To: James Douglas <jdd@xxxxxxxxxx>
Cc: mplindahl@xxxxxxxxxxxxx; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge replacement

Hi Mark there is thermal inertia in gauge , it gets very hot if full tank and you suddenly turn on . You are talking about the normal time to settle as temperature of bimetal comes into equilibrium with cooling rate of it — I think . on mechanical regulator you even see the steps at turn on .

It makes no difference if it soon settles in right place . Right ? by the way inherently very crude cheap thing , not an accurate device . Get it right near empty , you are good . F does not really matter.

I tend to keep a cheat sheet per car , some have almost nothing at empty some have 4 gallons . Fighting a dodge right now with 7 gallons at E . Not sender unless aftermarket or replacement or messed with . ( the problem with dodge ) Ohms there are defined , be sure float can move full depth of tank .. but thermal gauge itself is just crude . Never try to adjust it — they had some kind of jig— the two slots that look like adjusters interact with each other , I tried all that only made it worse . Replacement senders tend to have wrong curve adding to all this .

On Jun 27, 2024, at 7:33 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

It may be the step-down voltage regulator. Housed in the fuel gauge.

If you search the archives, you will see the details of how I replaced mine with a solid state REMOTE unit. I mounted it on the top of the lower steering column. If it dies, I can replace it in 5 minutes. I carry a spare.

There are only two kinds of in gauge regulators. Those that are going to fail and those that have failed.

James

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of mplindahl@xxxxxxxxxxxxx
Sent: Thursday, June 27, 2024 12:32
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: RE: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge replacement

Hi All,

I replaced the Fuel Gauge with a rebuilt one from Jeff Carter. I still have some problems.

When turning the key to ON position, the Fuel Gauge (when full) immediately goes to Full position (even slightly past the Full mark)
Then, it slowly moves down to 3/4, then ½, then eventually back to 7/8

Does this indicate a bad ground or, more likely, perhaps a problem with the Float? Thank you!

Regards,
Mark Lindahl

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of mplindahl@xxxxxxxxxxxxx
Sent: Saturday, June 1, 2024 12:29 PM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge replacement/Loose (extra) cream colored wire

Hello All,

I am just ready to check the shop manual, but I thought I would ask the experts!

I replaced by Fuel Gauge with a rebuilt one from Jeff Carter. So far, so good. The new one moves up and is close to Full. I did not start the engine, but all looks promising.

I noticed a Cream colored wire (single with push on black connector) that seems to be loose and not connected. It is near the left side by the shifter. It looks like the shifter has a dual wire connected at the bottom (assume neutral safety switch or back up lights ?)

If anyone knows where a single cream colored wire goes, please let me know. I am looking at the shop manual, but that does not always give a clue to the exact location to plug in. Thank you!

Regards,
Mark Lindahl
’63 300 Conv.
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