[pmccoy]

I am working on my list of items to wrap up before closing my bottom wing skins. I decided to finish off my QB fuel tanks, which includes installing the cover plate, fuel level sender, drain valve and pressure testing.

Searching other posts I have pretty much decided to throw out both the cork gasket on the cover plate, and the rubber gasket on the fuel sender cap. I will use lots of proseal on both including the screws.

My question is on the CAV-110 drain valve. I can't seem to find any info on whether these should be prosealed as well? Any comments would be appreciated.

 

[Mel]

Don't use proseal on the drain valve. Just a thread sealer. I use "form-a-gasket", but any good thread sealer will do fine.
You will likely be removing the drain valves every 5 years or so to clean the O-rings.

 

[Jeff R]

I asked Van's about the drain value and they recommended TFE paste or fuel lube. I did choose to use the rubber and cork seals, though.

Seems like several of us here are close to being ready to close up the bottom wing skings.

 

[Lionclaw]

Sorry to pop up an old thread...

Is nylon tape a bad idea for the drain valve threads? Can I buy any of the other stuff at the local hardware stores?

Should I be using anything on the 36degree fittings?

Thanks!

 

[kevinh]

Sorry to pop up an old thread...

Is nylon tape a bad idea for the drain valve threads? Can I buy any of the other stuff at the local hardware stores?

Should I be using anything on the 36degree fittings?

Thanks!

Yes - the tape is a bad idea - you don't want bits floating around in the tank. Fuel lube (AS&S sells a tube called 'ez turn') is the way to go. Unfortunately, you'll need to order it from one of the av parts suppliers.

 

[mikehoover]

When you install them just remember they only go about 2 or 3 turns if that much.