Reg Evans Posted February 2, 2018 Report 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
desoto1939 Posted February 2, 2018 Report 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
Dbolter Posted February 4, 2018 Report 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
Reg Evans Posted February 4, 2018 Author Report 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
Plymouthy Adams Posted February 4, 2018 Report 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
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