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Old 02-01-2005, 02:21 PM
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Need help with fuel gauge


I bought a truck with a fuel cell and an Auto Meter Ultra Lite fuel gauge. When I bought it, the fuel gauge wasn't working (it always showed below empty). I checked all of the connections and the gauge looked hooked up correctly but the sending unit on the fuel cell wasn't grounded. I grounded it to the frame and then the gauge showed 3/4 full which wasn't right as it was really only 1/2 full. So I drove it down to a 1/4 tank but the gauge still showed 3/4.

Thinking it was the sending until I replaced it with a Summit replacement (the fuel cell is also by Summit). Now this showed the tank as empty which is what the tank was so I thought it was working. However, when I filled the tank up I still get an empty reading and the gauge doesn't change. The needle does come up off of where it rests when I turn it on so I know it has power.

Currently, the fuel gauge has a wire connected to the sending unit, a power wire hooked up to the ignition, and a ground going to the firewall. The sending unit is grounded to the bed frame and of course has the wire to the gauge.

Does anyone have any advice? I am lost on getting this gauge working.

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Old 02-01-2005, 02:28 PM's Avatar
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The resistance of the sender must match the gauge. Sounds like incorrect pieces..
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Old 02-01-2005, 03:02 PM
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bobs right. First you need to find out what application your gage is for. There should be a part # on the back 4314-4318. Look in your Summit catalog and it will tell you the application and sending unit and resistance (ohms) required to match the gage. Remove the sending unit and bench test with and ohm meter. Attach the leads to the mounting flange (-) and output stud (+) then cycle the float from full to empty and check against the listings in the gage section and you will be able to figure out what pieces you have. Match the correct sender to your gage and your all done..

ps. The first page in my gallery has the Autometer instructions. It wouldn't link up.

Last edited by Pony; 02-01-2005 at 03:26 PM.
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Old 03-01-2005, 11:46 AM
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Just wanted to say thanks! I replaced the gauge with a 0-90 OHM to match the sending unit and it all works perfect now.

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