Thanks for the help, Zoltan.

> I would not use plastic coupler but steel or bronze, sold at Lowe's.

Okay.  Yeah, I'm thinking maybe the plastic coupler is deforming under
the pressure of the clamp.  The plastic coupler is just what I had
with me (one of those emergency hose repair kits).

In the meantime, should I bleed the system again since I lost some
coolant and adjusted the clamps?  I'm thinking I can do this solo by
wedging the throttle open, while topping off/bleeding.

> Yes, the valve can be changed and the bleeder has to be replaced the same
> time.  Easy job.  Obviously, you would have to take off the guard first,
> then empy the whole tank.

The tank is empty (at least no more propane flows).  So, I should just
open the bleeder to let out the remaining air pressure?

> I would first buy the parts.  They are sold
> either at an RV shop or at a propane place.  Common items, used on most
> tanks.

It sounds easy enough.  I will check RV/propane shops in Flagstaff.
Another listee gave me a link to a place he used.

Thanks again,

James