Electrical Sender Grounding and Fuel Tank Sealing question

[rv8ch]

Perhaps one of these with a toothed washer?

https://www.mcmaster.com/spade-termi...-type~adapter/

[Allan Stern]

I have been having issues with my right fuel tank sender on my RV 14A. The sender sometimes read fuel then it tells me it needs calibrating then reads fuel. Have been thinking the float is hanging up on inside rib? But perhaps the sender isn't grounded properly? Thoughts?

[flion]

More than one way to skin this cat. However, I can't see any downside to putting in a return wire just to make things sure. I built my -6A without and the Blue Mountain EFIS did not register, even though I had ground continuity and could see the changes on a multimeter as the sender was moved. So I put in a return, which also didn't work until I isolated the sender using shoulder washers under the screws (the sender had the rubber or whatever gasket under it). Now working since 2008 no problem. Also, my end plates are in using the cork gasket and fuel lube with no problem since new. I removed the right side once to install the return from the fuel purge shortly after I did my first flight but otherwise have not touched them. It is my opinion only that gasket failures are due to improper installation but the proseal method works and is fairly foolproof so I have no issue with those that use it.

[USN bullet]

I just installed the Fuel Sender units in both wings and I have now found the center screw is grounded on both wings. Before I used the pro seal the center was not grounded. I did not test the readings as the float was moved from empty to full positions. What did I do to cause both units to ground the center screw when I used the pro seal?
Thanks

[Arie]

Originally Posted by USN bullet

I just installed the Fuel Sender units in both wings and I have now found the center screw is grounded on both wings. Before I used the pro seal the center was not grounded. I did not test the readings as the float was moved from empty to full positions. What did I do to cause both units to ground the center screw when I used the pro seal?
Thanks

That’s exactly what you want, you want continuity to ground on the center screw.