68 camaro aftermarket fuel gauge pegged passed full
I have 3 total gauges temp oil and fuel all elect. They are using the same ground the oil and temp work just fine but as soon as i hook up the fuel it pegs out what could cause this i know maybe a short but it has good ground and power the only thing i can think of is the sending unit? help!!!
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Re: 68 camaro aftermarket fuel gauge pegged passed full
Jess, Make sure you don't have the ground and sender level circuits crossed at the gauge. If the needle is pegs to full it indicates an open circuit, if the needle pegs to empty it is indicating a short to ground.
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i'd change the engine temperature sender unit , or just disconnect it for a while and see if the gauge symptoms disappear , if they do then change the temp sender unit,if the symptoms remain i'd say get the OBD codes read as may have a faulty dash component
Yes, the sending unit is in the tank. If you unplug the connector at the tank and ground the gauge's sender unit wire to metal, with key on, the dash gauge should jump to full or near full. This verifies the dash gauge is working properly, and the problem is with the sender unit in the tank. If the gauge doesn't move when grounded, then the gauge or wiring from tank to gauge is not correct. Good luck.
Well, theres a sending unit/float in the tank that sends a signal thru
wires to your instrument cluster's fuel gauge. You should have an auto
electric repairperson determine where your problem lies. It's not often
the needle's just 'stuck' to where you could dislodge it. More often,
it's pegged overfull or underempty-signaling a shorted component
upstream of the gauge.
Similar problem and found the solution:
In the back of the gauge, where the 2 coils are located, there are very
tiny copper wires which connect all the resistors/diodes. they each
travel from within the coil and are soldered to 3 out of the 4 mounting
pins. if any of these wires are shorting out or disconnected, the gauge
- take the gauge and flip upside down
- temp gauge has 1 resistor (blue) and 1 diode (copper)
- fuel gauge has 2 resistors, no diodes
- 1 wire should be attached to bottom mounting pin (letter E for EMPTY)
- 1 wire should be attached to pin holding both resistors (half tank)
- 1 wire should be attached to the stand-alone ground pin (no mounting bracket)