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Fuel sending unit

 

I have a new plastic tank in my truck and when full the sending unit shows 1/3 full. This is a 12v conversion and I used the drop down registers. Any one have any suggestions. All other gages work as they should although I had to put a resister in line on the temp as it would peg. All sending units are new.?
 

Did you ground the sending unit?

On Jul 26, 2024 8:37 PM, jay bernhardt <bitrootvz@...> wrote:
I have a new plastic tank in my truck and when full the sending unit shows 1/3 full. This is a 12v conversion and I used the drop down registers. Any one have any suggestions. All other gages work as they should although I had to put a resister in line on the temp as it would peg. All sending units are new.?
 

Yes


On Fri, Jul 26, 2024, 9:49?PM Landen Schooler via <skoullar=[email protected]> wrote:
Did you ground the sending unit?

On Jul 26, 2024 8:37 PM, jay bernhardt <bitrootvz@...> wrote:
I have a new plastic tank in my truck and when full the sending unit shows 1/3 full. This is a 12v conversion and I used the drop down registers. Any one have any suggestions. All other gages work as they should although I had to put a resister in line on the temp as it would peg. All sending units are new.?
 

I replaced my tank 3 years ago with a plastic tank and had similar issues with the sending unit. I replaced the grounding wire twice as I was fairly certain that was my problem. If you have new gauges I'm sure you also have replaced the wiring harness, but if not... that was my issue.
 

My sending unit would register empty when the tank was full...the solution was to adjust the little metal tabs on the back that "limit" the range of the armature.
?
It's a long shot (as this is probably not causing your situation) but it's an easy thing to check (there's an outside chance that one of the arms may have been bent during shipping). You can also hook up a volt meter to measure the differing resistance of the gauge as it goes through the arc (there's not much resistance there, so you'll want to pick a very low setting--don't remember the ohms at "full" but it's not much).

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