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Testing and adjustment of a 56 Mopar Suburban (wagon) fuel gauge
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56D500boy
Posted 2021-12-07 5:54 PM (#617454)
Subject: Testing and adjustment of a 56 Mopar Suburban (wagon) fuel gauge



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For whatever reasons, the fuel sender and fuel gauges for the 55-56 Mopar wagons are different than those of the sedans. For the sedans (non-wagons), the gauge has two wires and the sender has one. For the wagons, the gauge has three wires and the sender, two wires. As a result the gauge and sender are unique to the wagons.

The upside is the gauge can be calibrated. Here is some information borrowed from the 1955-56 Plymouth and 56 Chrysler Factory Service Manuals (FSMs) that discusses the wiring, testing and calibration of the gauge.

First some info from the 56 Chrysler FSM:








Now more 56 Plymouth (as an example) info:



Edited by 56D500boy 2021-12-07 5:57 PM




(56PlymouthInstrumentsAndAccessoriesWiringDiagram.jpg)



(1622622_56PlymouthFuelGauge_1.jpg)



(1622622_56PlymouthFuelGauge_2.jpg)



(1622622_56PlymouthFuelGauge_3.jpg)



(1641679_56PlymouthSuburbanFuelLevelSender.jpg)



(ThermostaticFuelGaugeInfo_1.jpg)



(ThermostaticFuelGaugeInfo_2.jpg)



(ThermostaticFuelGaugeInfo_3.jpg)



(ThermostaticFuelGaugeInfo_4.jpg)



Attachments
----------------
Attachments 56PlymouthInstrumentsAndAccessoriesWiringDiagram.jpg (70KB - 19 downloads)
Attachments 1622622_56PlymouthFuelGauge_1.jpg (220KB - 21 downloads)
Attachments 1622622_56PlymouthFuelGauge_2.jpg (184KB - 20 downloads)
Attachments 1622622_56PlymouthFuelGauge_3.jpg (144KB - 20 downloads)
Attachments 1641679_56PlymouthSuburbanFuelLevelSender.jpg (68KB - 19 downloads)
Attachments ThermostaticFuelGaugeInfo_1.jpg (181KB - 21 downloads)
Attachments ThermostaticFuelGaugeInfo_2.jpg (155KB - 19 downloads)
Attachments ThermostaticFuelGaugeInfo_3.jpg (149KB - 19 downloads)
Attachments ThermostaticFuelGaugeInfo_4.jpg (135KB - 22 downloads)
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westaus29
Posted 2021-12-07 7:58 PM (#617456 - in reply to #617454)
Subject: Re: Testing and adjustment of a 56 Mopar Suburban (wagon) fuel gauge


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Location: Mandurah, Western Australia
You must be a mind reader!! The last few days I have been meaning to post a query about this same subject. I have a 55 Plymouth wagon which has been converted from original 6v to 12v. The fuel gauge and sender were both faulty when I got it so I replaced gauge and sender with a 2 part dcpd replacement that uses only a single wire but that goes from full to empty when still 3/4 full. I have now fixed the original sender and purchased a new original gauge and before installing am trying to work out how to handle the voltage change as both 55 and 56 use the same part numbers. I have the 55 manual and it has the info you have posted but need to review the 56 info. Thanks for what you have posted, will check and see how I go. I presume Plymouth and Dodge have same part numbers? Will post what I have. Jim
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56D500boy
Posted 2021-12-07 8:55 PM (#617457 - in reply to #617456)
Subject: Re: Testing and adjustment of a 56 Mopar Suburban (wagon) fuel gauge



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Posts: 8091
500020001000252525
Location: Lower Mainland BC
westaus29 - 2021-12-07 4:58 PM Thanks for what you have posted, will check and see how I go. I presume Plymouth and Dodge have same part numbers? Will post what I have.


I don't fully understand why the 55 6V and 56 12V Plymouth senders and gauges are the same but it seems they are. And they are the same for both 55-56 Plymouths and Dodges.

1622 622 Gauge (note: Note 1 relates to a filter (a 5 Micro Farad capacitor to remove "noise" from the gauge points opening and closing, interferring with the radio signal "NOTE 1: For 1956 model specify 1-1571 839 Filter"



1641 679 Sender:



Here you can see the instructions regarding the addition of the filter if the wagon was equipped with a radio.



Good Luck Jim





Edited by 56D500boy 2021-12-08 10:41 AM




(1571839_SuburbanFuelGaugeRadioInterferenceSuppressor.jpg)



(1571839_ElectricalNoiseFilter_1.jpg)



(1571839_ElectricalNoiseFilter_2.jpg)



Attachments
----------------
Attachments 1571839_SuburbanFuelGaugeRadioInterferenceSuppressor.jpg (176KB - 19 downloads)
Attachments 1571839_ElectricalNoiseFilter_1.jpg (237KB - 16 downloads)
Attachments 1571839_ElectricalNoiseFilter_2.jpg (232KB - 17 downloads)
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