We took our 'new' 87 Westy camping for the first time last week, but had to
cut the trip short because of a propane leak from under the regulator that
could not be stopped.

I'd filled up the propane tank just before we left; the attendant found the
bleeder valve, opened it while filling and then stopped the fill when gas
began coming out of the bleeder.  I believe that is the correct approach
for a non-auto-stop system.

However, soon after filling, the leak began.  It could not be stopped by
shutting off the service valve.  Over a few days, the leak completely
drained the tank.   I've now pulled the tank and see that there is a
manufactured pinhole under the regulator and this is where the leak was
from.  Is this some sort of fail-safe relief system in case the tank is
over-filled?

Where am I at now?  This is a completely stock propane system.  Do I need a
new regulator?  I'm guess I may also need a new service valve since
shutting it off neither stopped the leak nor stopped the flow of gas to the
stove.  And how does one get the service valve off?  I've tried with a 14"
pipe wrench and a fair amount of oomph, but no go.  Do I add 4 feet of
steel pipe to the pipe wrench and force it?

Thanks for any advice,

Rick