Did you pressure test the valve also? It looks like there's quite a bit of green stuff on it, maybe indicating leakage residue.
It may only leak in certain positions thru a stem seal. Hope you can get it figured out.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.