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This is what I have you can see 2 10mm bleeder screws above the petcock, those on the ones that are not tightening and therefore leaking.

Sorry I am away from the tractor a bit, but https://www.manua.ls/kubota/b7100hst/manual?p=40 shows closer to what I see, where there are 2 10mm bolts over the fuel petcock, and 1 12mm to the right. The leaking is froom the 2 10mm bolts. They hand tighten to a point, and then just freespin...

The pic is front the 7100 manual. I think, from the bleeding screws. When I close the fuel off, it stops, but when I open it is pretty steady, but hard to tell were from but it seems the bleeding screws to the "ficture"

Yes there are 2 you can vaugely seem 2 in the parts manual

I rqan the fuel out on my 7100 HST. When I did the normal procedure of loosening the bleeding screwing, I noticed that both of them would not tighten afterwards, and now are leaking fuel. Is there a trick to tightning them? I find it odd for both screws to go bad at the same time. Thanks!