Outside faucet only hot tap works

This is pretty odd. The outside tap on my Tracer 3000bhd (forest river brand) only has the hot tap working. I took apart the faucet and still the hot water tap when I turn on the pump works.

No cold water at all. There is a hex nut in behind the faucet assembly down in the collar a ways but I don't know if that would make a difference. It worked fine last year and if I have the hot tap turned off and the cold tap still without the assembly the pump kicks off. So it's not a burst line, I can't see any water anywhere and if it was broke the pump would run.

I looked under the bed and lifted the storage area to see the line and it looks fine.

Do I need to pull out that hex nut? Is it a valve back there that could be stuck?

I'm at a loss.

Thanks.