The fuel gauge on my 54 Chev 3100 is acting up again. The gauge needle tracks great when I raise the sending unit arm, but only to about 1/3 full. No matter how high I move the sender arm the needle stays at 1/3 full. When I bring the arm back down it tracks great again from 1/3 to empty. The gauge is the original 6 volt gauge with a Runtz voltage reducer.
I also have a new 30 Ohm sending unit that I bench tested with a multi-meter and it tracks 0-30 Ohms when moving the arm from the empty position to the full position.
I jumped the sending unit post to the sending unit cab ground wire and the gauge needle pegged to empty. I removed the sending unit wire to the gauge and the needle only pegs to 1/2 full. My understanding is that it should peg to full. I'm thinking the gauge is shot or in need of calibration but could I still be having a ground issue? Any suggestions are much appreciated.
