zimwiz Posted October 6, 2019 Share Posted October 6, 2019 Hi guys, Can anyone share their wisdom on diagnosing non-functioning gas gauge on a 1936 Packard 1405? Link to comment Share on other sites More sharing options...
John_Mereness Posted October 6, 2019 Share Posted October 6, 2019 I would start with seeking a replacement fuel sending gauge unit (I have had everything from floats that would not float to floats stuck to gas tank sealers, but mainly they tend to just be in gross condition), then work my way to gauge , and I assume you have a new wiring harness. 1 Link to comment Share on other sites More sharing options...
JACK M Posted October 6, 2019 Share Posted October 6, 2019 Not familiar with 36 Packard, but.... These days if its a one wire sender you can take the sender wire off of the tank and ground it, the gauge should peg with the sender wire to ground. (Ignition on) If it does indeed peg, its the sender. 2 Link to comment Share on other sites More sharing options...
trini Posted October 7, 2019 Share Posted October 7, 2019 Grounding the wire at the sending unit will make the dash gauge needle go up or down depending on the make. The best thing to do is to remove the sender from the tank and use a multi meter and check to see if the sender works. Do that by moving the float lever up or down. It should have a continuous reading from low to high. If the reading is skippy the wiring inside is worn and is in need of repair. The float could be saturated or leaking ( cork float ?) Bob Speedometer who advertises in the Hemmings is a good place to restore gauges. Link to comment Share on other sites More sharing options...
cheezestaak2000 Posted October 7, 2019 Share Posted October 7, 2019 all good advice, but i wouldn't drop the tank and remove sending unit un less i had a replacement for it in my hand. Link to comment Share on other sites More sharing options...
padgett Posted October 7, 2019 Share Posted October 7, 2019 Can check the tank sender and wiring at the dash. Some cars had a removable plate to get to the sender/pump from the trunk. Link to comment Share on other sites More sharing options...
Digger914 Posted October 8, 2019 Share Posted October 8, 2019 On 10/6/2019 at 9:05 AM, zimwiz said: Hi guys, Can anyone share their wisdom on diagnosing non-functioning gas gauge on a 1936 Packard 1405? I might be a little late on giving any useful answers for diagnosing as they have already been posted, but I can offer one suggestion prior to replacing a sending unit if grounding the sending unit wire swings the gage and that is: make certain the connection to the sending unit is good and attach a fresh ground to the tank before pulling the sending unit. A dirty or loose connection to sending unit or tank ground will make a good gage or sending unit look bad. Link to comment Share on other sites More sharing options...
trini Posted October 9, 2019 Share Posted October 9, 2019 I would like to see a picture of the sending unit if you have one. If it is anything like mine on the 28 DB Senior made by North East Electrical, it has an internal ground wire. that is possibly broken. Skippy reading ? you can probably replace the windings yourself, Link to comment Share on other sites More sharing options...
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