Hi all,

I have reason to believe that the VDO, resistive, fuel pressure sender on my RV-8 is bad. I'm going to double check the connections, but if they are good the next step is to replace the sender, and I have a couple of questions:

The sender is a VDO resistive, 2 bar "automotive" type. It's screwed into a manifold block that also has the oil pressure sender. As shown by the picture below. My understanding is that the ground for the sender is provided by the thread connection into the manifold.



I've researched various forums and some folks say to use NO thread sealant; others say use it on a few threads closest to the sender body. Yet other documents talk about how there is a thread channel for fluids to leak out if it's not a flared fitting (which I do not believe this is) and so you ALWAYS have t use some sealant.

What is the opinion here?

Sealant? Last few threads closest to the sender body? Permatex #2 ok? No sealant?

Secondly, how is this connection tightened? a torque value? TPFT?

Thanks!