Separate grounding for Vans fueltank senders?

[ao.frog]

Hi.

I'm in the process of doing the last zilloin tasks now, and one of them was connecting the wires in the wingroot.

When connecting the wires from the Vans fuel level senders, I noticed that the senders had no grounding wire.
(The kit is bought partly done)

I easily installed a separate gound wire for the sender in wing with the conventional fuelpick up, but the sender in wing with the floptube is not accessible without removing the tank.

I know that the instructions doesn't mention a separate ground wire, but I think it's a good idea anyway?

My question is this: is it really necessary to install separate ground wires for the Vans fuel level senders?
Or is it ok to install the + wires and let the grounding be taken care of by the tanks itself?

Maybe I'm overthinking this, but it's always nice to hear from other builders....

 

[jthocker]

Alf
Forget the extra ground, the senders will work just fine.

Good luck

 

[Kevin Horton]

Use an ohmmeter to check for continuity between the sender plate and the tank skin. I found that one of my senders had good continuity, so no additional ground was needed. But, the other sender was fully insulated from ground by all the proseal. I had to add a ground wire from a ring terminal under one of the bolts securing the sender to one of the bolts on the inboard Z-bracket.