Reg Evans Posted February 2, 2018 Report Share Posted February 2, 2018 What's it mean when the gas gauge in my 39 Chrysler cycles slowly between E and F when the engine is running ? Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted February 2, 2018 Report Share Posted February 2, 2018 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 1 Quote Link to comment Share on other sites More sharing options...
Dbolter Posted February 4, 2018 Report Share Posted February 4, 2018 I just put a new sending unit in my tank for my '38 chrysler .... $140 off eBay .... works good! 1 Quote Link to comment Share on other sites More sharing options...
Reg Evans Posted February 4, 2018 Author Report Share Posted February 4, 2018 Cool car ! Quote Link to comment Share on other sites More sharing options...
Reg Evans Posted February 4, 2018 Author Report Share Posted February 4, 2018 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 ? Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted February 4, 2018 Report Share Posted February 4, 2018 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... Quote Link to comment Share on other sites More sharing options...
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