01-28-2013, 09:36 PM
From info Chuck posted on classic:
I guess this is the best place to post the results of the new sender.
I compared a new stock(NS) sender, a new aftermarket(NA) sender and my new one(BC)
All empty to full at full, 3/4, 1/2, 1/4 and empty and random selected from my shelf.
The NS= 75.7, 59.8, 26.2, 19.4, 9.6
The NA= 87.1, 50.0, 37.1, 22.0,10.2
The BC= 77.0, 60.0, 26.5, 18.6, 9.3
So, based on that, a reading of 28 at the tank is a little more than 1/2 full. 48 ohms at the gauge should read about 5/8 full, with a working gauge. If I were you, I'd contact the guy that refurbishes the stock speedo clusters (classychassisrestoration.com) and ask him how much for a working fuel gauge. I haven't been able to find any new ones anywhere.
As an aside, the ohm readings should be the same at the tank and at the gauge. The 13 ohm difference could just be a grounding error or possibly wire resistance. If I were you, I'd check from one end of the wire to the other and see if there is any resistance measured through it. If there is, I'd replace it with a new wire. There should be a 0 ohm reading in the wire. Hope that helps. You are on the right track. Do all your other gauges work?
I guess this is the best place to post the results of the new sender.
I compared a new stock(NS) sender, a new aftermarket(NA) sender and my new one(BC)
All empty to full at full, 3/4, 1/2, 1/4 and empty and random selected from my shelf.
The NS= 75.7, 59.8, 26.2, 19.4, 9.6
The NA= 87.1, 50.0, 37.1, 22.0,10.2
The BC= 77.0, 60.0, 26.5, 18.6, 9.3
So, based on that, a reading of 28 at the tank is a little more than 1/2 full. 48 ohms at the gauge should read about 5/8 full, with a working gauge. If I were you, I'd contact the guy that refurbishes the stock speedo clusters (classychassisrestoration.com) and ask him how much for a working fuel gauge. I haven't been able to find any new ones anywhere.
As an aside, the ohm readings should be the same at the tank and at the gauge. The 13 ohm difference could just be a grounding error or possibly wire resistance. If I were you, I'd check from one end of the wire to the other and see if there is any resistance measured through it. If there is, I'd replace it with a new wire. There should be a 0 ohm reading in the wire. Hope that helps. You are on the right track. Do all your other gauges work?