An air pump fills what has gone flat, and tradition reads it as restoring energy, morale or confidence. Overfilling can stand for inflated expectations close to bursting.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.