New sending unit from herbs mopars. Have changed 3 fuel gauges . With 6 gals of fuel in the tank all 3 gauges reads a smidge above empty. With full tank gauges reads 3/4 . I bent the float and the gauge went past full and shorted out the gauge. Dash has new voltage reducer . Do i need a different sending unit. Every thread iv read said gauges arnt very accurate. Are they all calibrated this far off, please advise. Glen
Fuel gauge help
- Thread starter lucahemi
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Oklacarcollecto
Life is an experiment
Send a pm to redfish on this site. He is the guru on this and can calibrate your gauges if need be.
Please don't start a new thread on this, post back on your first thread so we can follow what you've done.
As I posted earlier, if you can supply the correct resistance when full, either with the sender or a substitute resistance, AND if you are sure the VR is OK then it is either
wiring/ connections
power (voltage) to the cluster
bad connections at the PC board/ VR/ gauge
or the gauge itself is bad.
""Bent the float arm and t went past full and shorted out the gauge"" That is supposed to be impossible. The sender has fixed stops. The stop should limit the resistance to no less than 9.5 ohms no matter what you do to the float arm.
Redfish . I am as bafled as you are. I stuck a meter and as posted earlier the ohms on the sender were 11 ohms to 78 ohms . 23 is supose to be half way . The tank had 6 gals of fuel (accurate as i drained the tank] and the gauge was reading 56 ohms. I have another fuel gauge i installed and they were about the same. The dash has a new voltage limiter and is putting out the 5-6 volts. Other gauges temp work fine. I have another dash that i jury rigged in the back of the vehicle to rull out a bad wire friom the sender to the dash / same results. When i filled the car up the gauge smoked as it went way past full and sparks flew. If the sender is putting out the proper ohms why is both gauges so out of calibration. Everybody on the site talks about poor quality sending units . My situation prior the car would read 3/4 (full ]and drop down drasticly in 50 miles and stay around 1/8 of a tank. Stop for gas and found out it took 5 =6 gals to take it back to the 3/4 mark (full of fuel]
Oklacarcollecto
Life is an experiment
Here is the link to the original thread for those that missed it.
http://www.forabodiesonly.com/mopar/showthread.php?t=196950
I'm not baffled at all. I've been into over 100 of these 40+ yr old gauges.
If you understood how they function you would understand why temp gauges live longer and hold accuracy much longer than fuel gauges.
Every gauge you have tried has nearly the same history like slices of bread from the same loaf.
I can restore a gauge and calibrate its accuracy from ohm to ohm throughout the range. I cant guanantee accurancy to your tweaked sender though.
I'm never amused by the do it yourselfers who R&R their instrument panel 3 or 4 times and eventually let the smoke out. When they do come to me for help they get it with level of service and support that can't be found elsewhere.
If you understood how they function you would understand why temp gauges live longer and hold accuracy much longer than fuel gauges.
Every gauge you have tried has nearly the same history like slices of bread from the same loaf.
I can restore a gauge and calibrate its accuracy from ohm to ohm throughout the range. I cant guanantee accurancy to your tweaked sender though.
I'm never amused by the do it yourselfers who R&R their instrument panel 3 or 4 times and eventually let the smoke out. When they do come to me for help they get it with level of service and support that can't be found elsewhere.
I'm not liking anything about these later model gauges. They dont have SW markings on them so I dont know if Stuart-Warner built them or not. I seriously doubt it. If they did I certainly see why they wouldn't put their brand on them. The design is pitiful. I'm not going to even atempt to explain how the difference in materials used effects the gauge accuracy. This design generates much less heat thus the gauge should last longer than its predecessors. It will show empty long before the tank is empty though.
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