Stewart Warner fuel sender discrepancies

[auburnaviator]

I am installing dual Stewart Warner fuel senders in my Sky Designs ER tanks. I therefore have 4 different (brand new from Vans) senders sitting in front of me bench testing them before install. 2 indicate normally on the multimeter ranging from 450ish ohms empty to 35ish ohms full. The other two have normal ohm readings except one shows OL when full and the other shows OL when empty. If you move the sender one click off of full or empty respectively, each sender then indicates normally for the rest of the range.

So here’s the question, are these two senders still usable. My thinking is I could put the one with the OL when full on the outboard of a tank and the one showing OL when empty on the inboard of a tank and this should provide normal readings on my G3X. The only issue I foresee would be if I run the tank with the OL when empty sender completely empty. Wouldn’t the G3X then revert back to showing full?

Am I reading too much into this?

 

[JeffPeters]

I had a similar issue with one I just received. I adjusted the arm length of the float so that it reached full and empty in the tank and stayed within the operating range on the sender without going to OL.

 

[Bill.Peyton]

Don't forget these senders need to be hooked in series! The easiest way is to isolate one of them from ground using the exact same method as Mooney does with an insulated washer. You can pick them up at Ace hardware.