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Fuel Gauge Calibration Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
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Powerflite |
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Expert 5K+ Posts: 9681 Location: So. Cal | I purchased an NOS fuel gauge for my '58 Coronet. The seller told me that it didn't work, and I got it cheap. But upon testing it, it does sense the change in resistance, it is just off from where it should be. It reads full at around 120 ohms and half full at around 350 ohms. So is there a way to calibrate this to make it work well? I have thought of just putting some resistors inline before the sender to make it work better, but it would be better and more reliable, if I can get it closer to where it should be. I have tried bending that copper track that covers the backend of the the needle as it moves, but it didn't seem to have much of an effect on it. Edited by Powerflite 2016-11-17 7:53 PM (Coronet Fuel Gauge.jpg) Attachments ---------------- Coronet Fuel Gauge.jpg (173KB - 191 downloads) | ||
1960fury |
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Expert 5K+ Posts: 7409 Location: northern germany | its just an ohmmeter, if that works you "calibrate" by bending the float bracket of the tank sending unit until it reads correctly. | ||
wizard |
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Board Moderator & Exner Expert 10K+ Posts: 13054 Location: Southern Sweden - Sturkö island | With full tank, check the reading on the gauge and the reading of an ohm meter. Note these values. Lets say that the fuel gauge doesn't go upp to the full Reading; add a low value resistor between the connecton on the tank sender and the sender Cable. Check reading on the gauge; if it's now on the full mark, then you add the prior ohm reading and the value of the resistor - this is the needed ohm Reading at full tank. Now remove the tank sender and adjust the arm to the correct ohm reading in the full position. Remove the added resistor/s and mount the tank sender - check the gauge and verify the full Reading. Yes, it's a painful operation, but it will work. | ||
Powerflite |
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Expert 5K+ Posts: 9681 Location: So. Cal | But, my point is that this is WAY off. The full reading on the sender is 10-15 ohms, and empty is 200 ohms. But the gauge is showing full at 120 and half full at 350. So it is a long ways off. Is there a way to calibrate the gauge itself to bring it closer to where it is supposed to work? | ||
57chizler |
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Expert Posts: 3778 Location: NorCal | I bought a NOS gauge for my '57 Dodge and had about the same results...while the new gauge was in the mail I discovered that the original gauge would work if I tapped it with a hammer. I now carry a jeweler's hammer and tap the gauge with every startup. Another unused part on the shelf because it was DOA. | ||
Powerflite |
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Expert 5K+ Posts: 9681 Location: So. Cal | I am wondering if the problem with this gauge is that I am giving it a full 12 Volts. Is it expecting 5 volts instead? That would explain why it is so far off if that's how it is setup behind the dash. I don't know if they used voltage limiters in '57-'58 or not. | ||
LD3 Greg |
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Expert Posts: 1906 Location: Ontario, Canada | No voltage limiters were used on 57/58 Mopars. Greg | ||
5wndwcpe |
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Veteran Posts: 131 | LD3 Greg - 2016-12-10 4:35 PM No voltage limiters were used on 57/58 Mopars. Greg So the gauges see a full 12v then ? | ||
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