While replacing the seals on my 91 westy I removed the expansion tank from
the passenger side.  While trying to do this the nipple broke off of the
valve that attaches to the line leading back to the charcoal filter.  The
dealer wants over $30 for the valve, and I don't yet know if the driver's
side will need replacing.  Is it a good idea to try to repair the broken
plastic nipple?  If so what is the best adhesive for this task?  Also, the
previous owner sprayed the entire underbody with bed liner, and while this
is generally good, it has made finding and removing some nuts difficult.  Is
there something that I can spray/brush/soak the stuff in to remove the
liner?