I'm working on my sons 64 Dart and I need to know what ohm range I should get from the fuel sending unit.
Thanks in advance for any help.
Lee

Resistance from lead of sending unit to ground should read 300 ohms or less depending on amount of fuel in your tank.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Thanks for the reply.
Is 300 the highest reading ?
I was thinking that 8 might be the lowest reading too.
Lee

That sending unit is just a variable resistor, depending on where the float is floating will determine the resistance. I don't know what the lowest reading would be, but it would probably be a little greater than zero. Resistance is at a minimum when the tank is full, about 300 ohms bone dry.

You could ground out the wire that attaches to the sending unit to simulate a full gage reading. If the gage dose not register full when grounding out its tank lead, than there is a gage problem, a poor dash ground, or possibly a dash voltage regulator malfunction.

Checking the brass connections in the tank to gage wire, and making sure they are clean & sound will be helpful. Poor, or corroded connections add resistance to the circuit, and can cause false gage readings, that is, lower readings on the gage than actual.

_________________
67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

I don't have my specs in front of me, but I'm fairly sure that at least from '65-up it's 10 ohms full and 77 ohms empty. Keep in mind that these weren't all the precise and so the #s can vary a bit, especially on the empty side. It's the same range for the oil and temp gauges for that vintage.

Thanks for the replies.
It turns out the float had a hole in it !!!

That means you have to call it a "sink"

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83 B-150 slant 6,4 speed. 79 B-300 360 pathfinder 4x4. 74 W-300 318 4x4 git-r-done 80 B-100 sl6,4speed