Look over all of the hoses, their connections and the filters inside each end to make sure there are no holes, cracks or kinks in them. Make certain that the hoses are tightly connected to each port and there is not a leak. Inspect the filters for clogs, too much dust or tears.
Replace any bad hoses or connections. If the end of each hose is bad, simply cut the tip of it off and put it back on it's port. Throw away dirty or clogged filters, and replace them with new ones. To be safe, use either electrical or duct tape around the filter housing of each, to prevent air leaks or separation of the housing.