RE: [Chrysler300] Gas Gauge on the 59 300E .......................................................

["John Holst jholst@xxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

I have a new sending unit sitting on the work bench for just
the same reason. Will have to drop the tank and drain the gas first. Over
winter the gas spoiled even with Sea Foam. Fouled the plugs and the gas
gauge went South. I had a couple of friends shake the back of the car
(scientific shake test) and was able to see the gauge move slightly. The
resistance range was 10 full and empty is 75 ohms. Easy to check by
moving the float while outside the tank. Did this once about 10 years ago
and worked fine until this winter. The original sending unit had corroded
when removed to clean and epoxy the tank. Just sitting on the floor for a
few days was a mistake. Reasonably sure the sending unit is the defect in
the system now. I also ran a check on the wiring from the tank to the
gauge and all was well. 

At 07:56 AM 4/24/2015, you wrote:

 
If you ground tank wire briefly, gauge should smoothly rise to full, if it does all is working there in dash . Problem is still in sensor . Some Chinese cheap replacement sensors have incorrect calibrations , wrong ohms, zero is off, arm length to float is all wrong . That happened in cuda. Added big time to woes. So save old one, it can usually be fixed. Or one from another mopar stripped for parts , I forget ohms but I think ~70 at E maybe 8-10 at full, if sensor right. That ohms can be right but arm bent wrong , or float no good.

Hope this help

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Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>

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Posted by: John Holst <jholst@xxxxxxxxx>

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