Sending Unit Gasket - Lubed or Dry?

[Boomer]

Getting ready to send the Imperial to the shop later this week if they're ready for it. Got the new tank painted and sending unit temporarily installed with a proper (thicker) lock ring and gasket. Having never put one of these in before, I'm curious - should the gasket be greased up first or put on completely dry? There's an O ring inside the filler neck opening that has grease or petroleum jelly on it which is what makes me wonder.

 

[mr. fix it]

Vaseline or synthetic caliper grease...

 

[Davea Lux]

Getting ready to send the Imperial to the shop later this week if they're ready for it. Got the new tank painted and sending unit temporarily installed with a proper (thicker) lock ring and gasket. Having never put one of these in before, I'm curious - should the gasket be greased up first or put on completely dry? There's an O ring inside the filler neck opening that has grease or petroleum jelly on it which is what makes me wonder.

RuGlyde rubber lubricant also works well. Keep in mind that the flat rubber gasket for the sending unit is being compressed to make the seal under the sending unit so it does not require much in the way of trying to make it slip and slide. The tank neck grommet on the other hand needs a generous amount of lube to get the tank neck inside the grommet without damaging it.

Dave

 

[Boomer]

Thanks guys. I did think about the possibilities of the stuff getting into the fuel if too much was used and wondered if it was even needed, considering the amount of compression the gasket will have once the lock ring is tight.

I remembered Gary mentioning that he had to adjust the sender for Bob's 300 downward to get it to read properly or sooner, so I gave this one a very slight nudge in that direction as well.