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fuel gauge all of the place 72 charger

jprather

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1972 charger , just put a new tank and sending unit in ( car had a fuel cell) hooked up everything, the fuel gauge is all over the place.

where should i start ? I'm thinking poss grounding problem at the sending unit ??
 
1972 charger , just put a new tank and sending unit in ( car had a fuel cell) hooked up everything, the fuel gauge is all over the place.

where should i start ? I'm thinking poss grounding problem at the sending unit ??
Make sure the sending unit is grounded. Did you put a ground strap on the lines when you put the tank in?
 
i didnt install myself, but, he said he did, i will put it on the lift and check for myself
 
The new sending units don't work well with our gauges.
 
yea, it swings from way below empty to pegged past full, and all points in-between ! if re-grounding doesnt work, what would i need to do to add an aftermarket fuel gauge to my gauge pod under the dash ?
 
First thing you need to determine is where the fault cause is. The sender, The gauge, or possibly even a bad wire. I'd start by removing the wire from the sender (outside of the tank) and connecting that wire direct to chassis ground. If the gauge pegs out full then most likely it and the wire are OK. If it still bounces all around odds are the gauge is bad but before spending all the time messing with that you might want to rule that out. You could connect the gauge directly to the sending unit with new wire.

Do you happen to have a factory service manual? Makes helping you out easier. Also which instrument cluster do you have?
 
well, i havent had a chance to investigate, but it now shows pegged on the empty side and wont move
 
found the culprit ! brand new sending unit was melted on the inside ! what would cause this ??
20240504_135145.jpg
20240504_135141.jpg
 
Yea, 12 v constant, fried my fuel gauge, put one under the dash
 
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