long range tank fuel drain valve

[WheelPantsOff]

I see there is a lively discussion, much aged, in a separate thread after I sent my earlier message.  Nice to see that the valves are still widely available.  The outboard valves are noticeable harder to depress than the factory valves; looking at the two images, I can't see that being from the size/incorrect part number.  I'm guessing something is blocking the actuation.

Thanks again to all.  Never a dull moment with these airplanes!

[Z W]

The new valves I've put in are much stiffer harder to sump than the old ones. I suspect it's a new design with a stronger spring that makes them less likely to leak. The downside being it takes longer, with a harder push, to get a good sump.

[Vance Harral]

12 hours ago, Z W said:

I suspect it's a new design with a stronger spring that makes them less likely to leak.

That may have been the theory, but in our experience the valves with the stronger springs were more prone to leak, not less.  All our hypotheses for why are suspect, so I won't bore you with our guesses.  But we went back to the less stiff springs and have had no trouble since.