Dave, one thing you said, made me wonder. You indicated the pump only ran 15 seconds. Could you watch the gauge and see what the pressure is when the pump comes on and the pressure when the pump cuts off again. It could be that your pump pressure is not adjusted properly. Typically you don't want it cycling on for that little time. Mine has an adjustable pressure switch in the bay with the 120 volt pump.
More info would help. Incidentally, mine is set to come on at 73 psi and shut off about 93 psi and mine runs for several minutes to build up the 20 psi. You certainly want it to come on before it gets down to 60 psi. My air bay slide and step cover don't work below about 60-63 psi.
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