Need help. Holley 4150, Fuel leak.

I have 2 suggestions for you,,

the first is put some grease on the flare nut threads, and on the nut side of the flare, to reduce the friction on the threads while tightening,.. I know,, it shouldn't make a diff,, but it does,, it gets that extra squeeze on the flare to get it to seat,.

other suggestion if that fails,,

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