Re: {Chrysler 300} 64 K fuel sender and gauge

Rather than use the expensive and hard to find Chrysler tool, you can buy a resistor decade box and use that. Basically, you dial up the resistances and check the gauge that way, These are the resistance values that the C-3826 tester uses.

Full =10 ohms
Med =23 ohms
Empty=74 ohms

I bought a used one on eBay for $25 a few years ago that was pretty good quality, but you can buy a new one from Amazon.

GLTL Resistance Box 0-9999.9Ω Adjustable Lab Resistor Substitution Box Precision 1W Variable Knob Switch Decade Boxes

GLTL Resistance Box 0-9999.9Ω Adjustable Lab Resistor Substitution Box P...

GLTL Resistance Box 0-9999.9Ω Adjustable Lab Resistor Substitution Box Precision 1W Variable Knob Switch Decade ...

You can also try to source some resistors to duplicate the values needed, but the decade box is so much easier.

For the ground, I've found it's better to run a ground wire directly to the sender housing rather than rely on the grounding clip. The grounding clip may work, but it depends on getting ground from the loose clips to the body. Any corrosion is cause for a bad ground with the fuel line. The ground wire to the sender always works. I've soldered the wire to the sender (obviously not in the car) but I also saw once where the wire was clamped onto the sender using a small hose clamp on the outlet as a temporary fix. You could probably also solder the wire to the clip instead.

All that said, the quick and easy way to test for gauge function is to ground the sender wire and see if the gauge "pegs" at high.

Hope this helps,

John

On Monday, February 14, 2022, 09:27:53 AM EST, apozdol@xxxxxxxxxxx <apozdol@xxxxxxxxxxx> wrote:

Might anyone have a gauge tester C-3826 that you may loan out , with a deposit of course?

I had my “new” leaking gas tank repaired and sealed and installed a new sending unit after seeing this one which the PO had customized. Had to share, too funny!

I now guess he may have done so because of the fuel gauge malfunctioning.

It never worked correctly as you can imagine with the fuel reading being lower than the actual fuel in the tank.

Now with the new sending unit, my gauge still reads low! I put five gallons of gas into the tank and the gauge barely reads above E, reading low just like before. I bounced the rear end a bunch of times, no change.

I will try a slip on ground clip on the tank in a bit, but I sure would like to check each component for prescribed resistance.

Does the gas gauge have any adjustments, or is it just resistors?

Allan

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