Fleetwood Pace Arrow 1984 Owner's Manual page 29

10. Do not use pliers or a wrench to tighten valves. If a
valve is not leak tight when closed by hand. see your
LP gas service representative.
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11. LP gas regulators must always be installed with the
diaphragm vent facing downward. Regulators that are not
in compartments have been equipped with a protective
cover. Make sure that regulator vent faces downward
and that cover is kept in place to minimize vent blockage
which could result in excessive gas pressure causing fire
or explosion.