grounded - leaking fuel bladder drain valve :(

[DXB]

I have the 27.4 gal/ side Griggs bladders in my C.  The fuel drain valve on one side just started leaking pretty briskly. I believe the part is distinct from the valves on the factory wet wing.  I don’t think it’s sediment holding the valve open - tried to clear it multiple times without success.  I suspect the o-ring is toast.  Anyone have the right part number to replace the o-ring or the whole valve as necessary?  Anything else I might be missing here?

[M20F]

All I will say is use proper torque fitting putting the new one in or you will twist it off, not that I would have any experience with that….

[BDPetersen]

I had an errant clamp that nicked the nipple on the bladder, causing a leak. Had to send the tank in for repair. Hope yours is simpler.

[A64Pilot]

2 hours ago, M20F said:

All I will say is use proper torque fitting putting the new one in or you will twist it off, not that I would have any experience with that….

Need more information, are you saying there is a special tool, or are you saying don’t overtighten?

[M20F]

18 hours ago, A64Pilot said:

Need more information, are you saying there is a special tool, or are you saying don’t overtighten?

Don’t over tighten the brass is a little fragile. 

[A64Pilot]

11 hours ago, M20F said:

Don’t over tighten the brass is a little fragile. 

Got it, thanks that’s what I thought

[DXB]

Fixed!  thank goodness it was the drain valve and not the nipple of the bladder or some other source.   Here’s the part for future reference for bladder owners:

F-391-18

[Yetti]

Think the part number is written on the face of those.   This is not a tractor tight application of torque.   Snug it and bit.

[DXB]

10 hours ago, Yetti said:

Think the part number is written on the face of those.   

I think so - it was a bit tough to read when 100LL was dripping in my eyeball though