Q.Grapefruit tree problem
My 3 or 4 year old Grapefruit Tree is not growing any leaves and the branches are dying back. I have no idea what has happened and I don’t know what to do.
Can you help.
Thanks. Kevin.

I'm sorry your Grapefruit Tree isn't doing well! Grapefruits aren't exactly the easiest trees to grow, so you may not have done much to contribute to this at all. This article gives some common issues that Grapefruit Trees have:
https://www.gardeningknowhow.com/edible/fruits/grapefruit/grapefruit-tree-not-producing.htm
You can try adding some light fertilizer and doing some light pruning of the dead branches to see if you can still save it, but there are no guarantees. This article may also help you: https://www.gardeningknowhow.com/edible/fruits/grapefruit/growing-grapefruit.htm