Re: {Chrysler 300} Sending Unit

most mopar senders you can buy today are for thermal gauges ; the 56 I assume us like 57 ? - it is a gauge with magnetic coils . Thermal ohms range is wrong

The thermal senders are ( for mopar ) about 10 ohms full and 80-90 ohms empty .

Those senders supplied , particularly by Vans , and others often have incorrect arm length resulting in reading E with 8 gallons in the tank, the float does not hit bottom of tank and rate of change will be wrong too ; not your problem necessarily but information . I got into this on a 57 i do not remember ohms range but believe it is higher ohms at E than a thermal sender . Someone with a 56-58 ( maybe 59?) sender can measure the max ohms exactly . Do you have the old one ?

When you say toast , as long as wire coil is intact it can be saved . Do not increase force or mess with / bend the little brush , if you do it will tear up the resistance wire winding .

Ford dealer has the brass tanks .

There is a product on Amazon , a kit you make your own sender , it may need mechanical adaption to the 56

tank closure disc . Cut off old one , use screws to mount the kit one inside tank to stub of old one . It is built at top for a ring of screw fasteners , most mopar have a lock ring .

Follow instruction exactly , pivot on this one must be in middle of tank ( they tell you the measurements ) . I first tried to duplicate the Chrysler one , with bent arm , offset pivot etc — Bad mistake .Turned kit to junk .( you cut stuff )

Well made thing maybe 20$ , but you will need to match ohms . Mine was for thermal gauge ( 10-90 )

key fact : Arm is kept straight moves equally up and down on new pivot in middle of tank depth .

Formula tells you how long to

make arm .

Sorry for not having brand etc on call in head .. A year back , kit worked great . I bought 3 more , having wasted days on this issue,,replacements thst are all wrong

hope the info helps you ,

On Oct 14, 2024, at 9:09 AM, towsonhe <towsonhe@xxxxxxxxx> wrote:

Hello all,

I am trying to track down the appropriate sending unit for my 1956 300B. The gas gauge reads full all the time. My mechanic replaced it when we flushed out the gas tank as the original was toast.

I'm not sure where he obtained this one, but it is running in the incorrect Ohm range. It is reading between 15-30 ohms, but the gauge according to the specs I have should be in the 75-100 ohm range. I have had the gauge checked by a reputable gauge rebuilder here in the Carolinas and they said it is perfect and that I have the wrong sending unit.

Any help is greatly appreciated!

Thank you,

-Heath

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Re: {Chrysler 300} Sending Unit - 1956 300B