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Posted

What's it mean when the gas gauge in my 39 Chrysler cycles slowly between E and F when the engine is running ?

Posted

Might a short might not have all the wire tight on the float unit. This is a 2 wire unit just like on my 39 Desoto could also be a ground issue. There are points on the gas gauge that make sort of a heat and this isalso what helps with the gas gage.

 

Rich Hartung

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Posted

I just put a new sending unit in my tank for my '38 chrysler ....  $140 off eBay .... works good!

 

 

IMG_6056.JPG

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Posted
On ‎2‎/‎2‎/‎2018 at 12:06 PM, desoto1939 said:

Might a short might not have all the wire tight on the float unit. This is a 2 wire unit just like on my 39 Desoto could also be a ground issue. There are points on the gas gauge that make sort of a heat and this isalso what helps with the gas gage.

 

Rich Hartung

 

Thanks Rich.....what does your 3rd sentence mean ?

Posted

the common input to the gas gauge goes into a bimetal type voltage regulator that opens at approx. 5 volt...this output feeds both coils  A and B while one pulls the gauge to full the other pulls the needle to empty thereby keeping a rock steady needle...the amount of resistance on each leg of A and B at the sending unit is divided across the wiper of the 30 ohm resistor to ground..for example, where A may have 10 ohms at x position B will feel the 20 ohms on its leg...

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